[destructuring] Implement basic binding destructuring infrastructure

test/mjsunit/harmony/destructuring.js

+// 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: --harmony-destructuring
+
+(function TestObjectLiteralPattern() {
+  var { x : x, y : y } = { x : 1, y : 2 };
+  assertEquals(1, x);
+  assertEquals(2, y);
+
+  var {z} = { z : 3 };
+  assertEquals(3, z);
+}());