Revert of Revert of Protect the emptiness of Array prototype elements with a PropertyCell.

test/mjsunit/elide-double-hole-check-12.js

Index: test/mjsunit/elide-double-hole-check-12.js
diff --git a/test/mjsunit/elide-double-hole-check-12.js b/test/mjsunit/elide-double-hole-check-12.js
new file mode 100644
index 0000000000000000000000000000000000000000..758734db89e58fcec8ee3d861e6cd3a816cc1ec3
--- /dev/null
+++ b/test/mjsunit/elide-double-hole-check-12.js
@@ -0,0 +1,23 @@
+// Copyright 2015 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
+
+function f1(a, i) {
+  return a[i] + 0.5;
+}
+
+var other_realm = Realm.create();
+var arr = [,0.0,2.5];
+assertEquals(0.5, f1(arr, 1));
+assertEquals(0.5, f1(arr, 1));
+%OptimizeFunctionOnNextCall(f1);
+assertEquals(0.5, f1(arr, 1));
+
+Realm.shared = arr.__proto__;
+
+// The call syntax is useful to make sure the native context is that of the
+// other realm.
+Realm.eval(other_realm, "Array.prototype.push.call(Realm.shared, 1);");
+assertEquals(1.5, f1(arr, 0));