[regexp] Port remaining JS functions in regexp.js

src/js/string.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
 
 var ArrayJoin;
 var GetSubstitution;
 var GlobalRegExp = global.RegExp;
 var GlobalString = global.String;
-var IsRegExp;
 var MaxSimple;
 var MinSimple;
-var RegExpInitialize;
 var matchSymbol = utils.ImportNow("match_symbol");
 var replaceSymbol = utils.ImportNow("replace_symbol");
 var searchSymbol = utils.ImportNow("search_symbol");
 var splitSymbol = utils.ImportNow("split_symbol");
 
 utils.Import(function(from) {
   ArrayJoin = from.ArrayJoin;
   GetSubstitution = from.GetSubstitution;
-  IsRegExp = from.IsRegExp;
   MaxSimple = from.MaxSimple;
   MinSimple = from.MinSimple;
-  RegExpInitialize = from.RegExpInitialize;
 });
 
 //-------------------------------------------------------------------
 
 // ECMA-262, section 15.5.4.6
 function StringConcat(other /* and more */) {  // length == 1
   "use strict";
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.concat");
   var s = TO_STRING(this);
   var len = arguments.length;
@@ skipping 11 matching lines @@
   if (!IS_NULL_OR_UNDEFINED(pattern)) {
     var matcher = pattern[matchSymbol];
     if (!IS_UNDEFINED(matcher)) {
       return %_Call(matcher, pattern, this);
     }
   }
 
   var subject = TO_STRING(this);
 
   // Equivalent to RegExpCreate (ES#sec-regexpcreate)
-  var regexp = %_NewObject(GlobalRegExp, GlobalRegExp);
-  RegExpInitialize(regexp, pattern);
+  var regexp = %RegExpCreate(pattern);
   return regexp[matchSymbol](subject);
 }
 
 
 // ES6, section 21.1.3.14
 function StringReplace(search, replace) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.replace");
 
   // Decision tree for dispatch
   // .. regexp search (in src/js/regexp.js, RegExpReplace)
@@ skipping 61 matching lines @@
   if (!IS_NULL_OR_UNDEFINED(pattern)) {
     var searcher = pattern[searchSymbol];
     if (!IS_UNDEFINED(searcher)) {
       return %_Call(searcher, pattern, this);
     }
   }
 
   var subject = TO_STRING(this);
 
   // Equivalent to RegExpCreate (ES#sec-regexpcreate)
-  var regexp = %_NewObject(GlobalRegExp, GlobalRegExp);
-  RegExpInitialize(regexp, pattern);
+  var regexp = %RegExpCreate(pattern);
   return %_Call(regexp[searchSymbol], regexp, subject);
 }
 
 
 // ECMA-262 section 15.5.4.13
 function StringSlice(start, end) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.slice");
 
   var s = TO_STRING(this);
   var s_len = s.length;
@@ skipping 309 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.StringMatch = StringMatchJS;
   to.StringReplace = StringReplace;
   to.StringSlice = StringSlice;
   to.StringSplit = StringSplitJS;
 });
 
 })