Make objects embedded in optimized code weak.

src/incremental-marking.cc

Index: src/incremental-marking.cc
diff --git a/src/incremental-marking.cc b/src/incremental-marking.cc
index df0f14a74cef8363e51c98bd3bdc8d2e60b44309..615c5437ddbd748076d88559eadf281371ae7bc0 100644
--- a/src/incremental-marking.cc
+++ b/src/incremental-marking.cc
@@ -648,6 +648,9 @@ void IncrementalMarking::StartMarking(CompactionFlag flag) {
   IncrementalMarkingRootMarkingVisitor visitor(this);
   heap_->IterateStrongRoots(&visitor, VISIT_ONLY_STRONG);
 
+  IncrementalMarkingMarkingVisitor::MarkObjectWithoutPush(

[Hannes Payer (out of office), 2013/10/01 13:13:50]

Why don't you call MarkWeakObjectToCode here?

[ulan, 2013/10/01 14:50:29]

Done.

+      heap_, heap_->weak_object_to_code());
+
   // Ready to start incremental marking.
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Running\n");