Implement the ES2015 version of Object.getPrototypeOf and add a test file for it (#2256)

JerryScript-DCO-1.0-Signed-off-by: Peter Marki marpeter@inf.u-szeged.hu

tests/jerry/object-getprototypeof.js

@@ -1,54 +0,0 @@
-// Copyright JS Foundation and other contributors, http://js.foundation
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-try {
-  var v;
-  Object.getPrototypeOf(v);
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  Object.getPrototypeOf("foo");
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  Object.getPrototypeOf(60);
-  assert (false);
-} catch (e) {
-  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);
-
-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);