Classes: Add support for arguments in default constructor

test/mjsunit/harmony/classes.js

 // Copyright 2014 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
 
 (function TestBasics() {
   var C = class C {}
   assertEquals(typeof C, 'function');
   assertEquals(C.__proto__, Function.prototype);
@@ skipping 606 matching lines @@
   class Derived extends Base {}
   var object = new Derived;
   assertEquals(1, calls);
 
   calls = 0;
   Derived();
   assertEquals(1, calls);
 })();
 
 
+(function TestDefaultConstructorArguments() {
+  var calls = 0;
+  var args, self;
+  class Base {
+    constructor() {
+      self = this;
+      args = arguments;
+    }
+  }
+  class Derived extends Base {}
+
+  new Derived;
+  assertEquals(0, args.length);
+
+  new Derived(0, 1, 2);
+  assertEquals(3, args.length);
+  assertTrue(self instanceof Derived);
+
+  var arr = new Array(1e5);
+  var obj = {};
+  Derived.apply(obj, arr);
+  assertEquals(1e5, args.length);
+  assertEquals(obj, self);
+})();
+
+
 /* TODO(arv): Implement
 (function TestNameBindingInConstructor() {
   class C {
     constructor() {
       assertThrows(function() {
         C = 42;
       }, ReferenceError);
     }
   }
   new C();
 })();
 */