Fix issue with __proto__ when using ES6 object literals

test/mjsunit/harmony/object-literals-method.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: --harmony-object-literals --allow-natives-syntax
 
 
 (function TestBasics() {
   var object = {
     method() {
@@ skipping 228 matching lines @@
   assertEquals(1, calls);
 })();
 
 
 (function TestGeneratorToString() {
   var object = {
     *method() { yield 1; }
   };
   assertEquals('*method() { yield 1; }', object.method.toString());
 })();
+
+
+(function TestProtoName() {
+  var object = {
+    __proto__() {
+      return 1;
+    }
+  };
+  assertEquals(Object.prototype, Object.getPrototypeOf(object));
+  assertEquals(1, object.__proto__());
+})();
+
+
+(function TestProtoName2() {
+  var p = {};
+  var object = {
+    __proto__() {
+      return 1;
+    },
+    __proto__: p
+  };
+  assertEquals(p, Object.getPrototypeOf(object));
+  assertEquals(1, object.__proto__());
+})();