Revert of [regexp] Remove IsRegExp intrinsic

src/debug/debug.js

 // Copyright 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 417 matching lines @@
 
 
 // Returns a Script object. If the parameter is a function the return value
 // is the script in which the function is defined. If the parameter is a string
 // the return value is the script for which the script name has that string
 // value.  If it is a regexp and there is a unique script whose name matches
 // we return that, otherwise undefined.
 Debug.findScript = function(func_or_script_name) {
   if (IS_FUNCTION(func_or_script_name)) {
     return %FunctionGetScript(func_or_script_name);
-  } else if (%IsRegExp(func_or_script_name)) {
+  } else if (IS_REGEXP(func_or_script_name)) {
     var scripts = this.scripts();
     var last_result = null;
     var result_count = 0;
     for (var i in scripts) {
       var script = scripts[i];
       if (func_or_script_name.test(script.name)) {
         last_result = script;
         result_count++;
       }
     }
@@ skipping 1941 matching lines @@
 utils.InstallFunctions(utils, DONT_ENUM, [
   "MakeExecutionState", MakeExecutionState,
   "MakeExceptionEvent", MakeExceptionEvent,
   "MakeBreakEvent", MakeBreakEvent,
   "MakeCompileEvent", MakeCompileEvent,
   "MakeAsyncTaskEvent", MakeAsyncTaskEvent,
   "IsBreakPointTriggered", IsBreakPointTriggered,
 ]);
 
 })