Fixed use of undefined in ArraySort....

src/array.js

 // Copyright 2006-2008 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 725 matching lines @@
 
   %RemoveArrayHoles(this);
 
   var length = ToUint32(this.length);
 
   // Move undefined elements to the end of the array.
   for (var i = 0; i < length; ) {
     if (IS_UNDEFINED(this[i])) {
       length--;
       this[i] = this[length];
-      this[length] = undefined;
+      this[length] = void 0;
     } else {
       i++;
     }
   }
 
   QuickSort(this, 0, length);
 
   // We only changed the length of the this object (in
   // RemoveArrayHoles) if it was an array.  We are not allowed to set
   // the length of the this object if it is not an array because this
@@ skipping 196 matching lines @@
     ArrayEvery: 1,
     ArrayMap: 1,
     ArrayIndexOf: 1,
     ArrayLastIndexOf: 1,
     ArrayPush: 1
   });
 };
 
 
 SetupArray();