Replace AddProperty by AddNamedProperty to speed up the common case

src/string.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $String = global.String;
 
 // -------------------------------------------------------------------
 
@@ skipping 897 matching lines @@
 // -------------------------------------------------------------------
 
 function SetUpString() {
   %CheckIsBootstrapping();
 
   // Set the String function and constructor.
   %SetCode($String, StringConstructor);
   %FunctionSetPrototype($String, new $String());
 
   // Set up the constructor property on the String prototype object.
-  %AddProperty($String.prototype, "constructor", $String, DONT_ENUM);
+  %AddNamedProperty($String.prototype, "constructor", $String, DONT_ENUM);
 
   // Set up the non-enumerable functions on the String object.
   InstallFunctions($String, DONT_ENUM, $Array(
     "fromCharCode", StringFromCharCode
   ));
 
   // Set up the non-enumerable functions on the String prototype object.
   InstallFunctions($String.prototype, DONT_ENUM, $Array(
     "valueOf", StringValueOf,
     "toString", StringToString,
@@ skipping 28 matching lines @@
     "fixed", StringFixed,
     "italics", StringItalics,
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup
   ));
 }
 
 SetUpString();