Clean up weak objects in optimized code.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index ffec178d42025c2d52eb8bfad7017816e1dbee59..5e6392187b084e4932f1e00b83422743a3a6dfae 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4562,6 +4562,19 @@ Object* Code::GetObjectFromEntryAddress(Address location_of_address) {
       FromAddress(Memory::Address_at(location_of_address) - Code::kHeaderSize);
 }
 
+bool Code::IsWeakObjectInOptimizedCode(Object* object) {
+  ASSERT(is_optimized_code());
+  if (object->IsMap()) {
+    return Map::cast(object)->CanTransition() &&
+           FLAG_collect_maps &&
+           FLAG_weak_embedded_maps_in_optimized_code;
+  }
+  if (object->IsJSObject() ||
+      (object->IsCell() && Cell::cast(object)->value()->IsJSObject())) {
+    return FLAG_weak_embedded_objects_in_optimized_code;
+  }
+  return false;
+}
 
 Object* Map::prototype() {
   return READ_FIELD(this, kPrototypeOffset);