Enable weak embedded objects in optimized code with a fix for heap verifier.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 4d8a45bb2d58d3066219dfc01d80b03ea64af9c9..7768272e55ef86e88ee8d5f6261d97f94fa09829 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4001,6 +4001,14 @@ class WeakHashTable: public HashTable<WeakHashTableShape<2>, Object*> {
   // key to the hole value causes removal of the whole entry.
   MUST_USE_RESULT MaybeObject* Put(Object* key, Object* value);
 
+  void Zap(Object* value) {

[Michael Starzinger, 2013/10/04 11:33:40]

nit: Maybe add a short one-liner comment explaining why we need this. Maybe
similar to ones in the Map class ...

// In general we only want to call these functions in release mode when
// heap verification is turned on.

[ulan, 2013/10/04 11:37:18]

Done.

+    int capacity = Capacity();
+    for (int i = 0; i < capacity; i++) {
+      set(EntryToIndex(i), value);
+      set(EntryToValueIndex(i), value);
+    }
+  }
+
  private:
   friend class MarkCompactCollector;