Trevor Norris

  I want to genertor a heap dump with unreachable objects , and I can look 
through to find object that can be  gc, but 

  cost too much memory。

// TODO(1562) Profiler assumes that any object that is in the heap after
  // full GC is reachable from the root when computing dominators.
  // This is not true for weakly reachable objects.
  // As a temporary solution we call GC twice.
  // heap_->CollectAllGarbage(
  //     Heap::kMakeHeapIterableMask,
  //     "HeapSnapshotGenerator::GenerateSnapshot");
  // heap_->CollectAllGarbage(
  //     Heap::kMakeHeapIterableMask,
  //     "HeapSnapshotGenerator::GenerateSnapshot");

should I just remove CollectAllGarbage code, to generate heap dump,  is 
that ok ?

@Trevor Norris 

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