Prototype of mark-and-compact support for Harmony weak maps.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 77dbcbdab06ef432cc832dbc6c9aa4cf6fb6a1ce..cdddca8a8fc40ae0094fc0f5e0d281e54f0a9ceb 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11834,10 +11834,9 @@ void ObjectHashTable::AddEntry(int entry, JSObject* key, Object* value) {
 }
 
 
-void ObjectHashTable::RemoveEntry(int entry) {
-  Object* null_value = GetHeap()->null_value();
-  set(EntryToIndex(entry), null_value);
-  set(EntryToIndex(entry) + 1, null_value);
+void ObjectHashTable::RemoveEntry(int entry, Heap* heap) {
+  set_null(heap, EntryToIndex(entry));
+  set_null(heap, EntryToIndex(entry) + 1);
   ElementRemoved();
 }