Fix issue with __proto__ when using ES6 object literals

test/mjsunit/harmony/object-literals-property-shorthand.js

Index: test/mjsunit/harmony/object-literals-property-shorthand.js
diff --git a/test/mjsunit/harmony/object-literals-property-shorthand.js b/test/mjsunit/harmony/object-literals-property-shorthand.js
index 2921495d892fba40e7f111fa0250b50777a75849..9756da46c10b4309f61cbba94c0dea6c63e4832c 100644
--- a/test/mjsunit/harmony/object-literals-property-shorthand.js
+++ b/test/mjsunit/harmony/object-literals-property-shorthand.js
@@ -49,3 +49,25 @@
   function f(x) { return {x}; }
   assertEquals('function f(x) { return {x}; }', f.toString());
 })();
+
+
+(function TestProtoName() {
+  var __proto__ = 1;
+  var object = {
+    __proto__
+  };
+  assertEquals(Object.prototype, Object.getPrototypeOf(object));
+  assertEquals(1, object.__proto__);
+})();
+
+
+(function TestProtoName2() {
+  var __proto__ = 1;
+  var p = {};
+  var object = {
+    __proto__: p,
+    __proto__,
+  };
+  assertEquals(p, Object.getPrototypeOf(object));
+  assertEquals(1, object.__proto__);
+})();