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

test/mjsunit/array-shift2.js

Index: test/mjsunit/array-shift2.js
diff --git a/test/mjsunit/array-shift2.js b/test/mjsunit/array-shift2.js
index 73d8cd4ff174602f7fd414b50139e1cdc25f02fd..75233ffec292213167bf6abe103e74e4eeeec9a7 100644
--- a/test/mjsunit/array-shift2.js
+++ b/test/mjsunit/array-shift2.js
@@ -12,7 +12,17 @@ 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"));