Internalize names before using them in slow-mode objects.

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 5903 matching lines @@
   return key->Hash();
 }
 
 
 uint32_t NameDictionaryShape::HashForObject(Name* key, Object* other) {
   return Name::cast(other)->Hash();
 }
 
 
 MaybeObject* NameDictionaryShape::AsObject(Heap* heap, Name* key) {
+  ASSERT(key->IsUniqueName());
   return key;
 }
 
 
 template <int entrysize>
 bool ObjectHashTableShape<entrysize>::IsMatch(Object* key, Object* other) {
   return key->SameValue(other);
 }
 
 
@@ skipping 316 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_