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3518 Commits

Author SHA1 Message Date
iposva@google.com 6267207e64 - Account for hidden frames when concatenating throw and 
catch traces.

R=asiva@google.com

Review URL: https://codereview.chromium.org//41503004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29218 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 22:08:33 +00:00
hausner@google.com 07c06be8e7 It's a compile-time error if a const constructor call fails 
Making it a compile-time error if a const constructor call
fails. Also improve error message when invoking dart code during
compilation fails.

Fixes issue 14302

R=srdjan@google.com

Review URL: https://codereview.chromium.org//40683002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29212 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 21:42:39 +00:00
zra@google.com 039a4c4078 Disconnects code objects from infrequently used unoptimized functions. 
Every 30 seconds (configurable by --code-collection-interval),
before a MarkSweep collection, this change halves a function's
usage count if it is unoptimized. If the function's usage count
reaches 0 as a result of this halving, it sets the function's
code pointers to null. Then, if the code object isn't marked
during the MarkSweep, it will be collected.

This change also checks for null code pointers in various
places, and recompiles/reconnects code if needed.

R=srdjan@google.com

Review URL: https://codereview.chromium.org//27802002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29209 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 21:26:15 +00:00
hausner@google.com cf4da8d1d9 Properly report error for certain expressions that must be const 
Issue error message instead of hitting assertion for an expression that
contains an assignment but is expected to be const.

Fixes security issue 13941

R=regis@google.com

Review URL: https://codereview.chromium.org//41113002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29194 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 18:54:52 +00:00
asiva@google.com a294e0a82f Fix for issue 14236: 
Retain script path of parent isolate when spawnFunction is called so that
it works when using script snapshots.

The test case issue14236_test.dart is a script snapshot whose original source
file path is issue14236_source.dart

R=iposva@google.com, sgjesse@google.com

Review URL: https://codereview.chromium.org//35393003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29178 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 16:41:22 +00:00
ajohnsen@google.com 8ef0f9e76f Add missing line to gyp file. 
BUG=
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//38983004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29155 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 07:13:25 +00:00
ajohnsen@google.com 28efa85e19 Add empty dart:platform library. 
dart:platform will be a library that contains information about the runtime
platform. While it's not written in stones, this is examples of properties that
may be queried:

- OS
- Browser
- Browser version
- Dart Version
- numberOfProcessors
- pathSeparator
- Native or JS VM

BUG=
R=ahe@google.com, asiva@google.com, floitsch@google.com, iposva@google.com, kasperl@google.com

Review URL: https://codereview.chromium.org//32683002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29154 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 06:56:36 +00:00
iposva@google.com 06719f8ea7 Fix bug 13827: 
- Do not attempt to GC old space while in full growth mode when creating
  the token stream for a newly loaded source file.

R=bak@google.com

Review URL: https://codereview.chromium.org//33753005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29153 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 05:45:09 +00:00
iposva@google.com 7fb172b783 - Don't mix the collection of Error.stackTrace with the collection of 
the stack trace for try-catch.

R=asiva@google.com

Review URL: https://codereview.chromium.org//38343004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29136 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-24 00:16:55 +00:00
hausner@google.com ddd9907e23 Implement type checks for switch expression 
If the switch expression is not compatible with the case clause
constants, we must report a runtime error. Implement this by annotating
the temporary variable holding the switch expression with the correct
type.

Issue 7274

R=regis@google.com

Review URL: https://codereview.chromium.org//34413007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29126 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 21:15:25 +00:00
regis@google.com 177276f059 Report compile-time error for const factories redirecting to malformed type 
(fix issue 14305).

R=iposva@google.com

Review URL: https://codereview.chromium.org//29013005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29123 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 21:03:11 +00:00
srdjan@google.com 8e7c6a5fae Move Stringinterpolation constant folding from constant propagator to canonicalizer. StrinIterpolateInstr cannot directlly refer to interpolation arguments but only to the array that holds them, therefore constant propagation cannot be applied. 
R=fschneider@google.com

Review URL: https://codereview.chromium.org//34523007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29118 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 20:37:18 +00:00
iposva@google.com d369b7a0c9 - Ensure that the token stream from generated source matches the 
original token stream in the presence of combinations of
  multiline string and string interpolation. If not this will
  cause mismatches when accessing code snippets, e.g when
  reporting parser errors or assertions.
- Ensure that ScanAll and ScanTo are in sync when adding or
  counting tokens.
- Added unit test for multiline strings and interpolation.
- Expanded GenerateSource unit test to iterate through all
  loaded libraries.
- Do not report columns for compilation errors in snapshotted
  code.
- Do not report columns from exceptions and errors when dealing
  with snapshotted code.
- Remove length field from TokenDescriptor. It was unused.
- Remove TokenStream::ComputeTokenPosition. It was unused.

R=fschneider@google.com, hausner@google.com

Review URL: https://codereview.chromium.org//36323003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29110 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 19:08:36 +00:00
fschneider@google.com 77669aac3e Fix VM issue 1372: super constructor invocation with redirection. 
A redirecting super constructor simply passes the phase parameter
on to the target which executes the corresponding phase.

BUG=https://code.google.com/p/dart/issues/detail?id=1372
R=hausner@google.com

Review URL: https://codereview.chromium.org//35693010

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29097 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 16:18:20 +00:00
zra@google.com 1efeb05d4d Fixes ARM SIMD IL bug. 
Issue 14341

R=fschneider@google.com

Review URL: https://codereview.chromium.org//37413002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29092 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 15:56:35 +00:00
fschneider@google.com a61e701da3 VM: Fix evaluation order when throwing an AbstractClassInstantiationError. 
BUG=https://code.google.com/p/dart/issues/detail?id=13420
TEST=Language/12_Expressions/12_Instance_Creation/1_New_A06_t12
R=zra@google.com

Review URL: https://codereview.chromium.org//37193002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29088 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 15:29:02 +00:00
fschneider@google.com 4ecceeebb6 Use enums for the index of IL operands. 
Addressing comments from a previous CL (https://codereview.chromium.org/28633003/).

R=srdjan@google.com

Review URL: https://codereview.chromium.org//35893012

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29087 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 15:27:09 +00:00
johnmccutchan@google.com 4ebeadba11 This CL enables the polymorphic inliner to inline loads on typed array views. 
It also contains a small cleanup so that the signatures of BuildByteArrayViewLoad and BuildByteArrayViewStore match.

R=fschneider@google.com

Review URL: https://codereview.chromium.org//26191002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29066 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 09:18:52 +00:00
rmacnak@google.com de7c68ce3a Test for OscillatorNode.type=. Fix bug in StringGetPeerHelper when passed an immediate object. Fix asserts when getting typed data address to allow for empty arrays. 
BUG=http://dartbug.com/11984
R=asiva@google.com, vsm@google.com

Review URL: https://codereview.chromium.org//28973003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29049 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-23 00:12:09 +00:00
regis@google.com 3e8c130227 Fix language tests for redirecting factories (issue 14297). 
Use target constructor name in redirecting factory errors.

R=hausner@google.com

Review URL: https://codereview.chromium.org//34903006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29045 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 22:36:42 +00:00
regis@google.com 9ec07853c5 Report correct error message in case of super invocation (fix issue 8208). 
R=hausner@google.com

Review URL: https://codereview.chromium.org//30533004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29042 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 22:12:07 +00:00
rmacnak@google.com cfa80041e9 VM: Always return immutable collections from the mirrors. 
Fix assert in partial demangling. Fix inappropriate compilation when handling parameters.

BUG=http://dartbug.com/14027
R=ahe@google.com, asiva@google.com

Review URL: https://codereview.chromium.org//34533003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29030 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 19:53:14 +00:00
iposva@google.com 6148a1879d - Name the enum containing the bootstrap library ids. 
R=asiva@google.com

Review URL: https://codereview.chromium.org//32633006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29012 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 17:40:30 +00:00
fschneider@google.com 593abec44c Fix bug with load elimination in checked mode. 
Definitions that are redefined through AssertAssignable must be
unwrapped to number loads/stores correctly for them.

Fix test expectations for tests that are passing now that the
corresponding co19 test was changed.

BUG=https://code.google.com/p/dart/issues/detail?id=13543
R=srdjan@google.com

Review URL: https://codereview.chromium.org//35093002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29001 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 16:03:48 +00:00
hausner@google.com e7255e091a Do not generate a compile-time error if there is more than one catch-all clause 
This includes catch clauses with malformed types, which are essentially
catch-all clauses.

The spec does not mandate such a compile-time error. (It probably did a long
time ago.)

Fixes issue 8601, 12159, 13019

R=iposva@google.com

Review URL: https://codereview.chromium.org//33813003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28999 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 15:44:28 +00:00
rmacnak@google.com bd284f7262 Generic typedefs and their referents. 
BUG=http://dartbug.com/12282
R=regis@google.com

Review URL: https://codereview.chromium.org//27728004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28972 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-22 00:00:08 +00:00
hausner@google.com dbe0e4c9b4 Allow string literal concatenation in import clauses 
Added benefit: if there is no interpolation in any of the adjacent
string literals, the compiler concatenates the strings without
invoking Dart code.

Fixes issues 12521, 6877

R=regis@google.com

Review URL: https://codereview.chromium.org//32513007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28964 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-21 22:13:42 +00:00
rmacnak@google.com a5fd049d73 Hide MirroredCompilationErrror behind a flag until post-1.0. Remove VM reference to MirroredUncaughtExceptionError. 
R=asiva@google.com, gbracha@google.com

Review URL: https://codereview.chromium.org//28053005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28946 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-21 20:12:49 +00:00
asiva@google.com f5b0f9beae Remove deprecated call Dart_Error from the API. There are no uses of it. 
R=turnidge@google.com

Review URL: https://codereview.chromium.org//26751005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28944 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-21 19:53:31 +00:00
regis@google.com 5a5edb7f0c Report use of malbounded interface in type test. 
Fix language tests related to malbounded types (issues 14123, 14131, 14132).

R=rmacnak@google.com

Review URL: https://codereview.chromium.org//33313003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28943 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-21 19:49:19 +00:00
fschneider@google.com 369a58132e Fix bugs in load elimination and type propagation. 
Load elimination should consider the representation of loads/stores
when numbering places. Different representations result now in different
places so that there can't be mixed representations at phis after
load elimination.

Removed the flag --propagate-types because type propagation is required
for correctness of smi-check hoisting. Therefore, switching it off does not
 make sense anymore.

BUG=https://code.google.com/p/dart/issues/detail?id=6663, https://code.google.com/p/dart/issues/detail?id=14271
R=kmillikin@google.com

Review URL: https://codereview.chromium.org//28633003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28931 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-21 13:59:56 +00:00
fschneider@google.com e227dbd349 VM: Fix bug in optimization of identical comparisons. 
When the propagated type information of a value refers to a generic
type parameter, assume that it can be a number. In that case we can't
eliminate the number check.

TBR=srdjan@google.com

Review URL: https://codereview.chromium.org//29023002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28856 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-18 12:56:47 +00:00
fschneider@google.com 8779bc8d7f Optimize identical-comparisons based on propagated type information. 
If the propagated type allows, eliminate the check for numbers at
identical operations in optimized code.

The previous optimizaton was done before full type propagation was run
and was therefore not very effective.

* Made flow-graph printing having no side-effects: calling Type() lazily
initializes the type_ and reaching_type_ fields of Value and Definition.
Access fields directly when printing instead.

Also, fixed two random spelling mistakes.

R=srdjan@google.com

Review URL: https://codereview.chromium.org//27727002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28851 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-18 11:13:59 +00:00
zra@google.com bc42f01492 Adds special case in ARM cpu feature detection. 
Qualcomm Krait CPUs in Nexus 4 and 7 misreport non-support
for integer division. This change checks the model string
reported by /proc/cpuinfo and enables integer division if
we are on one of these CPUs.

R=regis@google.com

Review URL: https://codereview.chromium.org//27731003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28827 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 21:29:57 +00:00
rmacnak@google.com c64d749f49 Remove conflict between type parameter and method/field from typevariable_mirror_metadata_test. Remove irregularity in metadata lookup naming that dealt with allow their co-existence. 
BUG=http://dartbug.com/13327
BUG=http://dartbug.com/14016

Review URL: https://codereview.chromium.org//27525007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28815 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 18:49:27 +00:00
asiva@google.com 1a2f236fab Fix issue 13942 - Dart_Error function invokes OS::VSNPrint with the "format" string containing data derived from the string 
R=iposva@google.com

Review URL: https://codereview.chromium.org//27694005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28809 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 17:49:45 +00:00
hausner@google.com 0e099ff048 Check that class member names do not conflict with type parameters 
Implement check that member names do not conflict with type
parameters. Simplify name checks in class namespace.
Mark typevariable_mirror_metadata_test as failing now that we
report the proper compile time errors. (The test expects no errors.)
Some co19 tests expect a name conflict between a setter X= and type
parameter X. This is still in flux from a language perspective. This
change list does not introduce an compile error for this case.

Fix for issue 13701.

R=srdjan@google.com

Review URL: https://codereview.chromium.org//27619002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28808 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 17:39:08 +00:00
zra@google.com 9aa3dd488e Fixes a bug in runtime call stub on arm and mips. 
GC was failing to visit the last argument to
runtime calls because the stack frame iterator
expects the same layout in the runtime call
stub as with other frames. Using the stub entry
macro ensures that the last argument is in the
expected place.

R=regis@google.com

Review URL: https://codereview.chromium.org//27588004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28803 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 15:08:59 +00:00
fschneider@google.com ee2678893c Improve canonicalization of strict comparisons and bool negation. 
This CL generalizes the existing optimization to handle all combinations

expr === true
expr !== true
expr === false
expr !== false

including lhs and rhs swapped. It also adds canonicalization of boolean
negation.

R=kmillikin@google.com

Review URL: https://codereview.chromium.org//27705003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28802 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 14:01:04 +00:00
rmacnak@google.com 58c1759454 Generic instantiations of mixins and interfaces. Equality of type parameters. 
BUG=http://dartbug.com/14113
BUG=http://dartbug.com/14114
R=regis@google.com

Review URL: https://codereview.chromium.org//27610002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28768 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-17 00:16:34 +00:00
iposva@google.com 0be514a68c - Add more data collection to the scavenger. 
- Fix runtime/PRESUBMIT.py script.

R=asiva@google.com

Review URL: https://codereview.chromium.org//27604002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28759 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 23:15:11 +00:00
srdjan@google.com 14b7cc4b18 Temporary disable string-interpolation constant folding until failures witj --optimization-counter-threshold=5 are resolved. 
Review URL: https://codereview.chromium.org//27581002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28749 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 20:53:03 +00:00
srdjan@google.com b83bda9e0e Add new style of string interpolation optimization: new nodes, working constant folding. 
TODO: partial constant fold of incoming arguments.

R=kmillikin@google.com

Review URL: https://codereview.chromium.org//27192005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28741 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 18:12:08 +00:00
asiva@google.com 4ee18d0673 - Rearrange bits in the bitfields to get better compaction, this reduces 
initial snapshot size by about 500 bytes.
- Fix initialization problem with redirecting factory bit

R=rmacnak@google.com, srdjan@google.com

Review URL: https://codereview.chromium.org//26565006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28736 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 17:40:07 +00:00
fschneider@google.com ed801a1b2f VM: Fix bug with evaluation order of static setter invocation. 
This fixes the case for an assignment of the form
v=e
where v is unknown. The right-hand side of the assignment
has to be evaluated before throwing a NoSuchMethodError.

I moved the generation of the NoSuchMethodError out of
the parser to the flow-graph builder, where the right-hand side
argument is evaluated before throwing.

BUG=https://code.google.com/p/dart/issues/detail?id=13494
TEST=co19/Language/12_Expressions/18_Assignment_A01_t07
R=hausner@google.com

Review URL: https://codereview.chromium.org//25842003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28723 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 13:07:58 +00:00
lrn@google.com 8b1d5720f7 Change "typedef" to "class" in core library and related tests. 
R=floitsch@google.com, johnniwinther@google.com

Review URL: https://codereview.chromium.org//27300003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28712 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 09:02:46 +00:00
regis@google.com 2d59eb0cb1 Throw a dynamic type error instead of a CastError in a type cast with a 
malbounded type (fix issue 14123).
Regression test is not checked in yet (see https://codereview.chromium.org/27378002/)

R=rmacnak@google.com

Review URL: https://codereview.chromium.org//27420002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28698 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 00:38:55 +00:00
rmacnak@google.com e8d030b338 Do not hide membership of implementation classes in dart:core. 
BUG=http://dartbuc.com/12141
R=ahe@google.com, asiva@google.com, gbracha@google.com

Review URL: https://codereview.chromium.org//27226003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28695 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-16 00:15:10 +00:00
regis@google.com 5d79a9ab02 Allow an interface to be (mal)bounded (fix issue 14118). 
Regression test is pending, but not checked in yet
(see https://codereview.chromium.org/27378002/).

R=rmacnak@google.com

Review URL: https://codereview.chromium.org//27238011

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28684 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-15 21:24:44 +00:00
turnidge@google.com 2ad40bc29b When a value has been optimized away by the compiler, set its value to 
"<optimized out>".  This will make it less confusing for people using
the debugger.

- Added constant_dead() to the flow graph.
- Added Symbols::OptimizedOut().

R=fschneider@google.com

Review URL: https://codereview.chromium.org//27339003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28671 260f80e4-7a28-3924-810f-c04153c831b5
 2013-10-15 18:35:07 +00:00