[runtime] Replace %to_string_fun with %_ToString.

src/string-iterator.js

 // Copyright 2014 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";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalString = global.String;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var stringIteratorIteratedStringSymbol =
     utils.ImportNow("string_iterator_iterated_string_symbol");
 var stringIteratorNextIndexSymbol =
     utils.ImportNow("string_iterator_next_index_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 // -------------------------------------------------------------------
 
 function StringIterator() {}
 
 
 // 21.1.5.1 CreateStringIterator Abstract Operation
 function CreateStringIterator(string) {
-  var s = TO_STRING_INLINE(string);
+  var s = TO_STRING(string);
   var iterator = new StringIterator;
   SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, s);
   SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, 0);
   return iterator;
 }
 
 
 // ES6 section 21.1.5.2.1 %StringIteratorPrototype%.next ( )
 function StringIteratorNext() {
   var iterator = this;
@@ skipping 47 matching lines @@
   'next', StringIteratorNext
 ]);
 %AddNamedProperty(StringIterator.prototype, toStringTagSymbol,
                   "String Iterator", READ_ONLY | DONT_ENUM);
 
 utils.SetFunctionName(StringPrototypeIterator, iteratorSymbol);
 %AddNamedProperty(GlobalString.prototype, iteratorSymbol,
                   StringPrototypeIterator, DONT_ENUM);
 
 })