[es6] Reenable new.target + Reflect.construct tests

test/mjsunit/harmony/new-target.js

 // 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.
 
 // Flags: --harmony-classes --harmony-new-target --harmony-reflect
 // Flags: --harmony-rest-parameters --harmony-arrow-functions
 
 
 (function TestClass() {
   'use strict';
@@ skipping 138 matching lines @@
     constructor(expected) {
       super(expected);
       assertInstanceof(this, RegExp);
     }
   }
   assertInstanceof(new Derived2(Derived2), RegExp);
   assertInstanceof(new Derived2(Derived2, 'extra'), RegExp);
 })();
 
 
-/*
-// TODO(arv): Reflect.construct does not work correctly with a third argument.
 (function TestReflectConstruct() {
   var calls = 0;
   function f(expected) {
     calls++;
     assertEquals(expected, new.target);
   }
 
   var o = Reflect.construct(f, [f]);
   assertEquals(Object.getPrototypeOf(o), f.prototype);
   o = Reflect.construct(f, [f, 'extra']);
   assertEquals(Object.getPrototypeOf(o), f.prototype);
   assertEquals(2, calls);
 
   calls = 0;
   o = Reflect.construct(f, [f], f);
   assertEquals(Object.getPrototypeOf(o), f.prototype);
   o = Reflect.construct(f, [f, 'extra'], f);
   assertEquals(Object.getPrototypeOf(o), f.prototype);
   assertEquals(2, calls);
 
 
   function g() {}
   calls = 0;
   o = Reflect.construct(f, [g], g);
   assertEquals(Object.getPrototypeOf(o), g.prototype);
   o = Reflect.construct(f, [g, 'extra'], g);
   assertEquals(Object.getPrototypeOf(o), g.prototype);
   assertEquals(2, calls);
 })();
-*/
 
 
 (function TestRestParametersFunction() {
   function f(...rest) {
     assertEquals(rest[0], new.target);
   }
 
   assertInstanceof(new f(f), f);
   assertInstanceof(new f(f, 'extra'), f);
 })();
@@ skipping 163 matching lines @@
   a0 = 1;
   a1 = 2;
   f(1, 2);
 
   length = 3;
   a0 = 1;
   a1 = 2;
   a2 = 3;
   f(1, 2, 3);
 })();