[elements] Add more tests to increase coverage

test/mjsunit/array-push.js

 // Copyright 2010 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 128 matching lines @@
   var a = [1,2,3];
   a.f = function() { return 10; }
   f(a, 4);
   f(a, 5);
   f(a, 6);
   %OptimizeFunctionOnNextCall(f);
   f(a, 7);
   f(a, {});
   assertEquals(10, a.f());
 })();
+
+
+(function testDoubleArrayPush() {
+  var a = [];
+  var max = 1000;
+  for (var i = 0; i < max; i++) {
+    a.push(i + 0.1);
+  }
+  assertEquals(max, a.length);
+  for (var i = 0; i < max; i++) {
+    assertEquals(i+0.1, a[i]);
+  }
+})();