Re-target for ES.Next (#3901)

A list of changes:
- 'es2015-subset' profile is deprecated, and an 'es.next' profile is added.
- The default profile is changed to 'es.next'
- Renamed the JERRY_ES2015 guard to JERRY_ESNEXT
- Renamed JERRY_ES2015_BUILTIN_* guards to JERRY_BUILTIN_*
- Moved es2015 specific tests to a new 'es.next' subdirectory
- Updated docs, targets, and test runners to reflect these changes

Resolves #3737.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/jerry/es.next/proxy_get_prototoype_of.js

@@ -0,0 +1,168 @@
+// 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 2015 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 target = {};
+var handler = { getPrototypeOf (target) {
+  throw 42;
+}};
+
+var proxy = new Proxy(target, handler);
+
+try {
+  // 19.1.2.9.2
+  Object.getPrototypeOf(proxy);
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+try {
+  // 19.1.3.3
+  Object.prototype.isPrototypeOf(proxy);
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+(function () {
+  class e extends Array {};
+  function f () {};
+  function g () {};
+
+  Object.setPrototypeOf(g, proxy);
+
+  // 7.3.19.7.b
+  try {
+    g instanceof f;
+    assert(false);
+  } catch (e) {
+    assert(e === 42);
+  }
+
+  // ecma_op_implicit_class_constructor_has_instance [[GetPrototypeOf]]
+  try {
+    g instanceof e;
+    assert(false);
+  } catch (e) {
+    assert(e === 42);
+  }
+})();
+
+try {
+  // 9.4.1.3.3
+  Function.prototype.bind.call(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// test basic functionality
+var target = {};
+var handler = {
+  getPrototypeOf(target) {
+    return Array.prototype;
+  }
+}
+var proxy = new Proxy(target, handler);
+
+assert(Object.getPrototypeOf(proxy) === Array.prototype);
+assert(Reflect.getPrototypeOf(proxy) === Array.prototype);
+assert(Array.prototype.isPrototypeOf(proxy));
+assert(proxy instanceof Array);
+
+var obj = Object.preventExtensions({});
+assert(Object.getPrototypeOf(obj) === Object.prototype);
+
+var handler = {
+  getPrototypeOf(target) {
+    return Object.prototype;
+  }
+}
+var proxy = new Proxy(target, handler);
+assert(Object.getPrototypeOf(proxy) === Object.prototype);
+
+// test with no trap
+var target = {};
+var handler = {};
+var proxy = new Proxy(target, handler);
+
+assert(Object.getPrototypeOf(proxy) === Object.prototype);
+
+// test with "undefined" trap
+var target = {};
+var handler = { getPrototypeOf: null };
+var proxy = new Proxy(target, handler);
+
+assert(Object.getPrototypeOf(proxy) === Object.prototype);
+
+// test with invalid trap
+var target = {};
+var handler = { getPrototypeOf: 42 };
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.getPrototypeOf(proxy)
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// test when target is proxy
+var target = {};
+var handler = {};
+var proxy = new Proxy(target, handler);
+
+var target_prototype = {};
+handler.getPrototypeOf = function() {
+  return target_prototype ;
+}
+
+var proxy2 = new Proxy(proxy, handler);
+assert(Object.getPrototypeOf(proxy2) === target_prototype);
+
+// test when invariants gets violated
+var target = {};
+var handler = {
+  getPrototypeOf(target) {
+    return 'foo';
+  }
+}
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.getPrototypeOf(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var target = Object.preventExtensions({});
+var handler = {
+  getPrototypeOf(target) {
+    return {};
+  }
+}
+
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.getPrototypeOf(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}