. Disables isolate spawning during Dart_Cleanup.
. Adds a static call Isolate::KillAllIsolates, which sends the
OOB Kill message to all isolates when called from
Dart_Cleanup.
. Modifies thread pool shutdown to block until all threads have
exited.
. Fixes tests.
BUG=
R=turnidge@google.com
Review URL: https://codereview.chromium.org//1177153005 .
../runtime/platform/assert.h: In member function ‘void dart::DynamicAssertionHelper::Equals(const E&, const A&) [with E = int, A = uint64_t]’:
../runtime/vm/thread_pool_test.cc:64: instantiated from here
../runtime/platform/assert.h:98: error: comparison between signed and unsigned integer expressions
Review URL: https://chromiumcodereview.appspot.com//9704037
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@5486 260f80e4-7a28-3924-810f-c04153c831b5