Fixed use of undefined in ArraySort....

test/mjsunit/array-sort.js

Index: test/mjsunit/array-sort.js
===================================================================
--- test/mjsunit/array-sort.js	(revision 404)
+++ test/mjsunit/array-sort.js	(working copy)
@@ -131,3 +131,12 @@
 }
 
 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();