Introduce InternalPackedArray.

src/v8natives.js

 // 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 1099 matching lines @@
     */
   } else {
     var desc = ToPropertyDescriptor(attributes);
     DefineOwnProperty(obj, name, desc, true);
   }
   return obj;
 }
 
 
 function GetOwnEnumerablePropertyNames(properties) {
-  var names = new InternalArray();
+  var names = new InternalPackedArray();
   for (var key in properties) {
     if (%HasLocalProperty(properties, key)) {
       names.push(key);
     }
   }
   return names;
 }
 
 
 // ES5 section 15.2.3.7.
 function ObjectDefineProperties(obj, properties) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("called_on_non_object", ["Object.defineProperties"]);
   }
   var props = ToObject(properties);
   var names = GetOwnEnumerablePropertyNames(props);
-  var descriptors = new InternalArray();
+  var descriptors = new InternalPackedArray();
   for (var i = 0; i < names.length; i++) {
     descriptors.push(ToPropertyDescriptor(props[names[i]]));
   }
   for (var i = 0; i < names.length; i++) {
     DefineOwnProperty(obj, names[i], descriptors[i], true);
   }
   return obj;
 }
 
 
@@ skipping 570 matching lines @@
 
 function SetUpFunction() {
   %CheckIsBootstrapping();
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "bind", FunctionBind,
     "toString", FunctionToString
   ));
 }
 
 SetUpFunction();