Fix the Object.getPrototypeOf function.

Related issue: #208

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

tests/jerry/object-create.js

@@ -128,8 +128,7 @@ try {
 // Create an object with null as prototype
 var obj = Object.create(null)
 assert (typeof (obj) === "object");
-// FIXME: enable this assertion after the #208 is fixed.
-// assert (Object.getPrototypeOf (obj) === null);
+assert (Object.getPrototypeOf (obj) === null);
 
 try {
     Object.create()

tests/jerry/object-getprototypeof.js

@@ -35,11 +35,21 @@ try {
   assert (e instanceof TypeError);
 }
 
+try {
+  var y = Object.getPrototypeOf(null);
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
 var obj = { x : "foo" };
-assert (Object.getPrototypeOf(obj) === Object.prototype)
+assert (Object.getPrototypeOf(obj) === Object.prototype);
 
 var constructor = function () {};
 constructor.prototype = obj;
 
 var d_obj = new constructor();
 assert (Object.getPrototypeOf(d_obj) === obj);
+
+obj = Object.create(null);
+assert (Object.getPrototypeOf(obj) === null);