Fixed use of undefined in ArraySort....

test/mjsunit/array-sort.js

 // Copyright 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 113 matching lines @@
   var a = [];
   a[4] = "18";
   a[10] = "12";
   a.sort();
   assertEquals(11, a.length);
   assertEquals("12", a[0]);
   assertEquals("18", a[1]);
 }
 
 TestArraySortingWithHoles();
+
+// Test array sorting with undefined elemeents in the array.
+function TestArraySortingWithUndefined() {
+  var a = [3, void 0, 2];
+  a.sort();
+  assertArrayEquals([ 2, 3, void 0], a);
+}
+
+TestArraySortingWithUndefined();