Revert of [regexp] Remove IsRegExp intrinsic

src/debug/mirrors.js

 // Copyright 2006-2012 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";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 130 matching lines @@
   } else if (IS_STRING(value)) {
     mirror = new StringMirror(value);
   } else if (IS_SYMBOL(value)) {
     mirror = new SymbolMirror(value);
   } else if (IS_ARRAY(value)) {
     mirror = new ArrayMirror(value);
   } else if (IS_DATE(value)) {
     mirror = new DateMirror(value);
   } else if (IS_FUNCTION(value)) {
     mirror = new FunctionMirror(value);
-  } else if (%IsRegExp(value)) {
+  } else if (IS_REGEXP(value)) {
     mirror = new RegExpMirror(value);
   } else if (IS_ERROR(value)) {
     mirror = new ErrorMirror(value);
   } else if (IS_SCRIPT(value)) {
     mirror = new ScriptMirror(value);
   } else if (IS_MAP(value) || IS_WEAKMAP(value)) {
     mirror = new MapMirror(value);
   } else if (IS_SET(value) || IS_WEAKSET(value)) {
     mirror = new SetMirror(value);
   } else if (IS_MAP_ITERATOR(value) || IS_SET_ITERATOR(value)) {
@@ skipping 2913 matching lines @@
 // Functions needed by the debugger runtime.
 utils.InstallFunctions(utils, DONT_ENUM, [
   "ClearMirrorCache", ClearMirrorCache
 ]);
 
 // Export to debug.js
 utils.Export(function(to) {
   to.MirrorType = MirrorType;
 });
 })