Enable the profiler on the simulator

Enable the profiler on the simulator

R=asiva@google.com

Committed: https://code.google.com/p/dart/source/detail?r=41752

[Cutch, 2014-11-14 17:14:19]

johnmccutchan@google.com changed reviewers:
+ asiva@google.com, iposva@google.com

[Cutch, 2014-11-14 17:15:30]

https://codereview.chromium.org/718393005/diff/20001/runtime/vm/assembler_arm...
File runtime/vm/assembler_arm64.h (right):

https://codereview.chromium.org/718393005/diff/20001/runtime/vm/assembler_arm...
runtime/vm/assembler_arm64.h:1720: int32_t opc = 0;
Fixes Mac compilation error.

[siva, 2014-11-14 18:02:51]

LGTM with one comment that we discussed offline regarding the potential
possibility that ticks in Dart frames could be
dropped.

https://codereview.chromium.org/718393005/diff/20001/runtime/vm/isolate.cc
File runtime/vm/isolate.cc (right):

https://codereview.chromium.org/718393005/diff/20001/runtime/vm/isolate.cc#ne...
runtime/vm/isolate.cc:694: }
When this function is called by Profiler::RecordSampleInterruptCallback for a
sample in dart code the dart stack pointer is going to be
compared against the native stack pointer limits and it might end up skipping
that sample as the stack boundary could potentially be invalid.

[Cutch, 2014-11-14 23:15:12]

Committed patchset #3 (id:40001) manually as 41752 (presubmit successful).