Rename IS_SPEC_OBJECT macro to IS_RECEIVER.

src/js/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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 60 matching lines @@
     return this;
 }
 
 
 // ES6 section 22.1.5.2.1 %ArrayIteratorPrototype%.next( )
 function ArrayIteratorNext() {
   var iterator = this;
   var value = UNDEFINED;
   var done = true;
 
-  if (!IS_SPEC_OBJECT(iterator) ||
+  if (!IS_RECEIVER(iterator) ||
       !HAS_DEFINED_PRIVATE(iterator, arrayIteratorNextIndexSymbol)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'Array Iterator.prototype.next', this);
   }
 
   var array = GET_PRIVATE(iterator, arrayIteratorObjectSymbol);
   if (!IS_UNDEFINED(array)) {
     var index = GET_PRIVATE(iterator, arrayIteratorNextIndexSymbol);
     var itemKind = GET_PRIVATE(iterator, arrayIterationKindSymbol);
     var length = TO_UINT32(array.length);
@@ skipping 73 matching lines @@
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.ArrayValues = ArrayValues;
 });
 
 %InstallToContext(["array_values_iterator", ArrayValues]);
 
 })