[es6] Iterators and generators should "extend" %IteratorPrototype%

src/array-iterator.js

 // Copyright 2013 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 $iteratorCreateResultObject;
 var $arrayValues;
 
 (function(global, shared, exports) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 var GlobalArray = global.Array;
-var GlobalObject = global.Object;
 
 macro TYPED_ARRAYS(FUNCTION)
   FUNCTION(Uint8Array)
   FUNCTION(Int8Array)
   FUNCTION(Uint16Array)
   FUNCTION(Int16Array)
   FUNCTION(Uint32Array)
   FUNCTION(Int32Array)
   FUNCTION(Float32Array)
   FUNCTION(Float64Array)
@@ skipping 89 matching lines @@
 function ArrayValues() {
   return CreateArrayIterator(this, ITERATOR_KIND_VALUES);
 }
 
 
 function ArrayKeys() {
   return CreateArrayIterator(this, ITERATOR_KIND_KEYS);
 }
 
 
-%FunctionSetPrototype(ArrayIterator, new GlobalObject());
+%FunctionSetPrototype(ArrayIterator, {__proto__: $iteratorPrototype});
 %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator');
 
 $installFunctions(ArrayIterator.prototype, DONT_ENUM, [
   'next', ArrayIteratorNext
 ]);
 $setFunctionName(ArrayIteratorIterator, symbolIterator);
 %AddNamedProperty(ArrayIterator.prototype, symbolIterator,
                   ArrayIteratorIterator, DONT_ENUM);
 %AddNamedProperty(ArrayIterator.prototype, symbolToStringTag,
                   "Array Iterator", READ_ONLY | DONT_ENUM);
@@ skipping 14 matching lines @@
   %AddNamedProperty(GlobalNAME.prototype, symbolIterator, ArrayValues,
                     DONT_ENUM);
 endmacro
 
 TYPED_ARRAYS(EXTEND_TYPED_ARRAY)
 
 $iteratorCreateResultObject = CreateIteratorResultObject;
 $arrayValues = ArrayValues;
 
 })