Switch UnreachableObjectsFilter to use Marking instead of InstrusiveMarking.

src/mark-compact-inl.h

Index: src/mark-compact-inl.h
diff --git a/src/mark-compact-inl.h b/src/mark-compact-inl.h
index 3e283072f2a768d33f395ed040769b8e55a4878c..3ebc6c532d3bbab9a226ff5441b31b9c1b3df964 100644
--- a/src/mark-compact-inl.h
+++ b/src/mark-compact-inl.h
@@ -96,6 +96,12 @@ void MarkCompactCollector::RecordSlot(Object** anchor_slot,
 }
 
 
+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_