Add UseCounters for various standards-related code paths

src/js/regexp.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) {
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
@@ skipping 253 matching lines @@
     regexp_val =
       new GlobalRegExp(
           %_SubString(REGEXP_SOURCE(regexp), 2, REGEXP_SOURCE(regexp).length),
           (REGEXP_IGNORE_CASE(regexp) ? REGEXP_MULTILINE(regexp) ? "im" : "i"
                                       : REGEXP_MULTILINE(regexp) ? "m" : ""));
   }
   return regexp_val;
 }
 
 
-var kRegExpPrototypeToString = 12;
-
 function RegExpToString() {
   if (!IS_REGEXP(this)) {
     // RegExp.prototype.toString() returns '/(?:)/' as a compatibility fix;
     // a UseCounter is incremented to track it.
     // TODO(littledan): Remove this workaround or standardize it
     if (this === GlobalRegExpPrototype) {
       %IncrementUseCounter(kRegExpPrototypeToString);
       return '/(?:)/';
     }
     throw MakeTypeError(kIncompatibleMethodReceiver,
@@ skipping 288 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.RegExpExec = DoRegExpExec;
   to.RegExpExecNoTests = RegExpExecNoTests;
   to.RegExpLastMatchInfo = RegExpLastMatchInfo;
   to.RegExpTest = RegExpTest;
 });
 
 })