Don't create new maps in CurrentMapForDeprecated.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3606 matching lines @@
     }
     if (FLAG_track_heap_object_fields &&
         details.representation().IsHeapObject()) {
       return true;
     }
   }
   return false;
 }
 
 
-Handle<Map> Map::CurrentMapForDeprecated(Handle<Map> map) {
-  if (!map->is_deprecated()) return map;
-  return GeneralizeRepresentation(map, 0, Representation::Smi());
-}
-
-
 void Map::NotifyLeafMapLayoutChange() {
   dependent_code()->DeoptimizeDependentCodeGroup(
       GetIsolate(),
       DependentCode::kPrototypeCheckGroup);
 }
 
 
 bool Map::CanOmitPrototypeChecks() {
   return !HasTransitionArray() && !is_dictionary_map() &&
          FLAG_omit_prototype_checks_for_leaf_maps;
@@ skipping 2578 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_