Replace AddProperty by AddNamedProperty to speed up the common case

src/date.js

 // Copyright 2006-2008 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.
 
 "use strict";
 
 // This file relies on the fact that the following declarations have been made
 // in v8natives.js:
 // var $isFinite = GlobalIsFinite;
 
@@ skipping 745 matching lines @@
   %FunctionSetPrototype($Date, new $Date(NAN));
 
   // Set up non-enumerable properties of the Date object itself.
   InstallFunctions($Date, DONT_ENUM, $Array(
     "UTC", DateUTC,
     "parse", DateParse,
     "now", DateNow
   ));
 
   // Set up non-enumerable constructor property of the Date prototype object.
-  %AddProperty($Date.prototype, "constructor", $Date, DONT_ENUM);
+  %AddNamedProperty($Date.prototype, "constructor", $Date, DONT_ENUM);
 
   // Set up non-enumerable functions of the Date prototype object and
   // set their names.
   InstallFunctions($Date.prototype, DONT_ENUM, $Array(
     "toString", DateToString,
     "toDateString", DateToDateString,
     "toTimeString", DateToTimeString,
     "toLocaleString", DateToLocaleString,
     "toLocaleDateString", DateToLocaleDateString,
     "toLocaleTimeString", DateToLocaleTimeString,
@@ skipping 34 matching lines @@
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear,
     "toISOString", DateToISOString,
     "toJSON", DateToJSON
   ));
 }
 
 SetUpDate();