Narrow cases where Sparse/Smart versions of Array methods are used

test/mjsunit/array-shift2.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax
 
 Object.defineProperty(Array.prototype, "1", {
   get: function() { return "element 1"; },
   set: function(value) { }
 });
 function test(array) {
   array.shift();
   return array;
 }
-assertEquals(["element 1",2], test(["0",,2]));
-assertEquals(["element 1",{}], test([{},,{}]));
+
+var result = test(["0",,2]);
+assertEquals(["element 1","element 1"], result);
+assertTrue(result.hasOwnProperty("0"));
+assertFalse(result.hasOwnProperty("1"));
+result = test([{},,{}]);
+assertEquals(["element 1","element 1"], result);
+assertTrue(result.hasOwnProperty("0"));
+assertFalse(result.hasOwnProperty("1"));
 %OptimizeFunctionOnNextCall(test);
-assertEquals(["element 1",0], test([{},,0]));
+result = test([{},,0]);
+assertEquals(["element 1","element 1"], result);
+assertTrue(result.hasOwnProperty("0"));
+assertFalse(result.hasOwnProperty("1"));