This is the re-application of 44e8da3ecd
with fixes:
* Dartanalyzer error is fixed in the new test isolate/message4_test
* The new test is skipped in the status file in dart2j/non-d8 modes,
issue #30247 is created.
* Minor tweak of Closure_equals: other.IsClosure() is tested earlier.
Original CL review:
https://codereview.chromium.org/2989493002/
Original CL description:
This CL introduces a new Function kind, kImplicitClosureFunction, in
order to simplify check for implicit closures and make it more
efficient.
This CL also fixes Function::IsImplicitStaticClosureFunction(RawFunction*)
to correctly handle implicit closures created from static native
functions.
Closes#30203.
As the result of a faster check for implicit closures and slight
refactoring of Closure_equals, micro-benchmark exercising Closure_equals
speeds up from 9618ms to 6700ms for implicit closures case and
insignificantly for other cases.
R=zra@google.com
Review-Url: https://codereview.chromium.org/2987703002 .
Alexander Markov
bda3c9c2b2