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/es2015/object-getprototypeof.js

@@ -0,0 +1,37 @@
+// 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.
+
+var a = true;
+obj = Object.getPrototypeOf(a);
+assert (obj == Boolean.prototype);
+
+a = 5;
+obj = Object.getPrototypeOf(a);
+assert (obj == Number.prototype);
+
+a = "string";
+obj = Object.getPrototypeOf(a);
+assert (obj == String.prototype);
+
+a = [1,2,3];
+obj = Object.getPrototypeOf(a);
+assert (obj == Array.prototype);
+
+try {
+  a = null;
+  obj = Object.getPrototypeOf(a);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}