Switch UnreachableObjectsFilter to use Marking instead of InstrusiveMarking.

src/mark-compact-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 78 matching lines @@
     if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
                             object_page->slots_buffer_address(),
                             slot,
                             SlotsBuffer::FAIL_ON_OVERFLOW)) {
       EvictEvacuationCandidate(object_page);
     }
   }
 }
 
 
+bool MarkCompactCollector::IsLiveBytesUpdateRequired(HeapObject* obj) {
+  return Marking::IsBlack(Marking::MarkBitFrom(obj)) &&
+      !obj->GetHeap()->mark_compact_collector()->AreMarkbitsTainted();
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_INL_H_