Fix bug in Object.defineProperty where a growing lements dictionary was ignored.

src/handles.h

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 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
 //       with the distribution.
@@ skipping 154 matching lines @@
 // They might invoke garbage collection. The result is an handle to
 // an object of expected type, or the handle is an error if running out
 // of space or encountering an internal error.
 
 void NormalizeProperties(Handle<JSObject> object,
                          PropertyNormalizationMode mode,
                          int expected_additional_properties);
 void NormalizeElements(Handle<JSObject> object);
 void TransformToFastProperties(Handle<JSObject> object,
                                int unused_property_fields);
-void NumberDictionarySet(Handle<NumberDictionary> dictionary,
-                         uint32_t index,
-                         Handle<Object> value,
-                         PropertyDetails details);
+MUST_USE_RESULT Handle<NumberDictionary> NumberDictionarySet(
+    Handle<NumberDictionary> dictionary,
+    uint32_t index,
+    Handle<Object> value,
+    PropertyDetails details);
 
 // Flattens a string.
 void FlattenString(Handle<String> str);
 
 // Flattens a string and returns the underlying external or sequential
 // string.
 Handle<String> FlattenGetString(Handle<String> str);
 
 Handle<Object> SetProperty(Handle<JSReceiver> object,
                            Handle<String> key,
@@ skipping 179 matching lines @@
   inline NoHandleAllocation();
   inline ~NoHandleAllocation();
  private:
   int level_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_