Rename IS_SPEC_OBJECT macro to IS_RECEIVER.

src/js/harmony-regexp.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.
 
 (function(global, utils) {
 
 'use strict';
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalRegExp = global.RegExp;
 var MakeTypeError;
 var regExpFlagsSymbol = utils.ImportNow("regexp_flags_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
 });
 
 // -------------------------------------------------------------------
 
 // ES6 draft 12-06-13, section 21.2.5.3
 // + https://bugs.ecmascript.org/show_bug.cgi?id=3423
 function RegExpGetFlags() {
-  if (!IS_SPEC_OBJECT(this)) {
+  if (!IS_RECEIVER(this)) {
     throw MakeTypeError(
         kRegExpNonObject, "RegExp.prototype.flags", TO_STRING(this));
   }
   var result = '';
   if (this.global) result += 'g';
   if (this.ignoreCase) result += 'i';
   if (this.multiline) result += 'm';
   if (this.unicode) result += 'u';
   if (this.sticky) result += 'y';
   return result;
@@ skipping 19 matching lines @@
   return !!REGEXP_UNICODE(this);
 }
 %FunctionSetName(RegExpGetUnicode, "RegExp.prototype.unicode");
 %SetNativeFlag(RegExpGetUnicode);
 
 utils.InstallGetter(GlobalRegExp.prototype, 'flags', RegExpGetFlags);
 utils.InstallGetter(GlobalRegExp.prototype, 'sticky', RegExpGetSticky);
 utils.InstallGetter(GlobalRegExp.prototype, 'unicode', RegExpGetUnicode);
 
 })