Implement new Reflect methods (#3549)

This patch implements the get, set, has, deleteProperty, ownKeys, and construct methods of the Reflect objects. The Reflect.construct method is missing the new_target support because ecma_op_function_construct doesn't support it yet.

JerryScript-DCO-1.0-Signed-off-by: Daniella Barsony bella@inf.u-szeged.hu

tests/jerry/es2015/reflect-get.js

@@ -0,0 +1,55 @@
+// 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.
+
+// Copyright 2017 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.
+
+var object1 = {
+  x: "Bat",
+  y: "Cat"
+};
+
+assert (Reflect.get (object1, 'y') === "Cat");
+
+try {
+  Reflect.get ();
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+assert (Reflect.get ({}) === undefined);
+
+var o = {x: 10};
+function foo () {
+  try {
+    return Reflect.get (o, "x");
+  } catch (e) {
+    return 1;
+  }
+}
+
+assert (10 === foo());
+
+var c = {};
+function foo2 (a) {
+  try {
+    return Reflect.get (c, a);
+  } catch (e) {
+    return 1;
+  }
+}
+
+assert (1 === foo2 ({[Symbol.toPrimitive]() { throw new Error(); }}));