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Siva Annamalai da487a567c Fix for issue 27380 - VM stuck in deadlock with background finalization and background compiler thread
- fixed an inadvertant flip in the safepoint check in this cl
    https://github.com/dart-lang/sdk/commit/e72c1fb47

  -  return (IsMutatorThread() ||
  -          (isolate_ != NULL && !isolate_->thread_registry()->AtSafepoint()));
  +  return (IsMutatorThread() || IsAtSafepoint());

- increase the scope of CanCollectGarbage in Heap::AllocateOld to also
  account for the tasks lock as checking for tasks inside a safepoint
  scope can lead to deadlocks

- fix an aggressive assertion in compiler for expected errors being only
  LanguageErrors to allowing UnhandledExceptions (OOM, stack overflows etc.)

- fix an aggressive assert in exception handler (handler pc can be 0 even in the mutator thread.

- workaround issue 27413 in PageSpace::CanIncreaseCapacityInWords

BUG=27380
R=fschneider@google.com

Review URL: https://codereview.chromium.org/2363823002 .
2016-09-23 10:14:12 -07:00
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