i18n.js was not using original functions

src/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 GlobalRegExp = global.RegExp;
 var GlobalString = global.String;
 var InternalArray = utils.InternalArray;
 var InternalPackedArray = utils.InternalPackedArray;
 
+var ArrayIndexOf;
+var ArrayJoin;
 var MathMax;
 var MathMin;
 var RegExpExec;
 var RegExpExecNoTests;
 var RegExpLastMatchInfo;
 
 utils.Import(function(from) {
+  ArrayIndexOf = from.ArrayIndexOf;
+  ArrayJoin = from.ArrayJoin;
   MathMax = from.MathMax;
   MathMin = from.MathMin;
   RegExpExec = from.RegExpExec;
   RegExpExecNoTests = from.RegExpExecNoTests;
   RegExpLastMatchInfo = from.RegExpLastMatchInfo;
 });
 
 //-------------------------------------------------------------------
 
 function StringConstructor(x) {
@@ skipping 150 matching lines @@
 //
 // For now we do nothing, as proper normalization requires big tables.
 // If Intl is enabled, then i18n.js will override it and provide the the
 // proper functionality.
 function StringNormalizeJS(form) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.normalize");
 
   var form = form ? TO_STRING_INLINE(form) : 'NFC';
 
   var NORMALIZATION_FORMS = ['NFC', 'NFD', 'NFKC', 'NFKD'];
-
-  var normalizationForm = NORMALIZATION_FORMS.indexOf(form);
+  var normalizationForm =
+      %_CallFunction(NORMALIZATION_FORMS, form, ArrayIndexOf);
   if (normalizationForm === -1) {
-    throw MakeRangeError(kNormalizationForm, NORMALIZATION_FORMS.join(', '));
+    throw MakeRangeError(kNormalizationForm,
+                         %_CallFunction(NORMALIZATION_FORMS, ', ', ArrayJoin));
   }
 
   return %_ValueOf(this);
 }
 
 
 // This has the same size as the RegExpLastMatchInfo array, and can be used
 // for functions that expect that structure to be returned.  It is used when
 // the needle is a string rather than a regexp.  In this case we can't update
 // lastMatchArray without erroneously affecting the properties on the global
@@ skipping 976 matching lines @@
   "sub", StringSub,
   "sup", StringSup
 ]);
 
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.StringCharAt = StringCharAtJS;
   to.StringIndexOf = StringIndexOfJS;
+  to.StringLastIndexOf = StringLastIndexOfJS;
+  to.StringMatch = StringMatchJS;
+  to.StringReplace = StringReplace;
+  to.StringSplit = StringSplitJS;
+  to.StringSubstr = StringSubstr;
   to.StringSubstring = StringSubstring;
 });
 
 })