Phantom references support internal fields

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 2e90174ba019021814d2b576e4b1be4e35cde7c4..8f50ca89cb91325ee8d13024b844ccee7657edcd 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1560,9 +1560,10 @@ void Heap::Scavenge() {
   isolate()->global_handles()->RemoveObjectGroups();
   isolate()->global_handles()->RemoveImplicitRefGroups();
 
-  isolate_->global_handles()->IdentifyNewSpaceWeakIndependentHandles(
+  isolate()->global_handles()->IdentifyNewSpaceWeakIndependentHandles(
       &IsUnscavengedHeapObject);
-  isolate_->global_handles()->IterateNewSpaceWeakIndependentRoots(
+
+  isolate()->global_handles()->IterateNewSpaceWeakIndependentRoots(
       &scavenge_visitor);
   new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
 
@@ -1667,6 +1668,10 @@ void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) {
   // TODO(mvstanton): AllocationSites only need to be processed during
   // MARK_COMPACT, as they live in old space. Verify and address.
   ProcessAllocationSites(retainer);
+  // Collects callback info for handles that are pending (about to be
+  // collected) and either phantom or internal-fields.  Releases the global
+  // handles.  See also PostGarbageCollectionProcessing.
+  isolate()->global_handles()->CollectPhantomCallbackData();
 }