Avoid calling inherited setters when creating object literals and their boilerplates.

src/handles.cc

 // Copyright 2009 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 262 matching lines @@
                      Object);
 }
 
 
 Handle<Object> ForceDeleteProperty(Handle<JSObject> object,
                                    Handle<Object> key) {
   CALL_HEAP_FUNCTION(Runtime::ForceDeleteObjectProperty(object, key), Object);
 }
 
 
-Handle<Object> IgnoreAttributesAndSetLocalProperty(
+Handle<Object> SetLocalPropertyIgnoreAttributes(
     Handle<JSObject> object,
     Handle<String> key,
     Handle<Object> value,
     PropertyAttributes attributes) {
   CALL_HEAP_FUNCTION(object->
-      IgnoreAttributesAndSetLocalProperty(*key, *value, attributes), Object);
+      SetLocalPropertyIgnoreAttributes(*key, *value, attributes), Object);
 }
 
 
 Handle<Object> SetPropertyWithInterceptor(Handle<JSObject> object,
                                           Handle<String> key,
                                           Handle<Object> value,
                                           PropertyAttributes attributes) {
   CALL_HEAP_FUNCTION(object->SetPropertyWithInterceptor(*key,
                                                         *value,
                                                         attributes),
@@ skipping 115 matching lines @@
       bool has_exception;
       Handle<Object> number = Execution::ToNumber(value, &has_exception);
       if (has_exception) return Handle<Object>();
       value = number;
     }
   }
   CALL_HEAP_FUNCTION(object->SetElement(index, *value), Object);
 }
 
 
+Handle<Object> SetOwnElement(Handle<JSObject> object,
+                             uint32_t index,
+                             Handle<Object> value) {
+  ASSERT(!object->HasPixelElements());
+  ASSERT(!object->HasExternalArrayElements());
+  CALL_HEAP_FUNCTION(object->SetElement(index, *value, false), Object);
+}
+
+
 Handle<JSObject> Copy(Handle<JSObject> obj) {
   CALL_HEAP_FUNCTION(Heap::CopyJSObject(*obj), JSObject);
 }
 
 
 Handle<Object> SetAccessor(Handle<JSObject> obj, Handle<AccessorInfo> info) {
   CALL_HEAP_FUNCTION(obj->DefineAccessor(*info), Object);
 }
 
 
@@ skipping 447 matching lines @@
 
 OptimizedObjectForAddingMultipleProperties::
 ~OptimizedObjectForAddingMultipleProperties() {
   // Reoptimize the object to allow fast property access.
   if (has_been_transformed_) {
     TransformToFastProperties(object_, unused_property_fields_);
   }
 }
 
 } }  // namespace v8::internal