[elements] Add more tests to increase coverage

test/mjsunit/delete.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 160 matching lines @@
   delete x.a;
   assertTrue(typeof load_a(x) === 'undefined', "x.a is gone");
   assertTrue(typeof load_a(x) === 'undefined', "x.a is gone");
 }
 
 function load_a(x) {
   return x.a;
 }
 
 load_deleted_property_using_IC();
+
+
+(function deleteLargeDoubleArrayAtEnd() {
+  var o = {};
+  var max = 100000;
+  for (var i = 0; i <= max; i++) {
+    o[i] = 1.1;
+  }
+  delete o[max];
+  for (var i = 0; i < max; i++) {
+    assertEquals(1.1, o[i]);
+  }
+  assertEquals(undefined, o[max]);
+})();