Phantom references support internal fields

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 9c481b09a9d326b4bd59fdbf79d431404008dc11..176267536e965304f676069295011ab983ddf1ee 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -2213,10 +2213,8 @@ void MarkCompactCollector::MarkLiveObjects() {
       &IsUnmarkedHeapObject);
   // Then we mark the objects and process the transitive closure.
   heap()->isolate()->global_handles()->IterateWeakRoots(&root_visitor);
-  while (marking_deque_.overflowed()) {
-    RefillMarkingDeque();
-    EmptyMarkingDeque();
-  }
+
+  ProcessMarkingDeque();
 
   // Repeat host application specific and Harmony weak maps marking to
   // mark unmarked objects reachable from the weak roots.