Array.prototype.{slice,splice} should use [[DefineOwnProperty]] to generate return value

test/mjsunit/regress/regress-423633.js

Index: test/mjsunit/regress/regress-423633.js
diff --git a/test/mjsunit/regress/regress-423633.js b/test/mjsunit/regress/regress-423633.js
new file mode 100644
index 0000000000000000000000000000000000000000..cad20645ba942417f75f07bc124172bfeef8320e
--- /dev/null
+++ b/test/mjsunit/regress/regress-423633.js
@@ -0,0 +1,10 @@
+// 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.
+
+Object.defineProperty(Array.prototype, '0', {
+  get: function() { return false; },
+});
+var a = [1, 2, 3];
+assertEquals(a, a.slice());
+assertEquals([3], a.splice(2, 1));