[runtime] Replace %to_string_fun with %_ToString.

src/symbol.js

 // Copyright 2013 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();
 
@@ skipping 40 matching lines @@
 function SymbolValueOf() {
   if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "Symbol.prototype.valueOf", this);
   }
   return %_ValueOf(this);
 }
 
 
 function SymbolFor(key) {
-  key = TO_STRING_INLINE(key);
+  key = TO_STRING(key);
   var registry = %SymbolRegistry();
   if (IS_UNDEFINED(registry.for[key])) {
     var symbol = %CreateSymbol(key);
     registry.for[key] = symbol;
     registry.keyFor[symbol] = key;
   }
   return registry.for[key];
 }
 
 
@@ skipping 53 matching lines @@
 ]);
 
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.SymbolToString = SymbolToString;
 })
 
 })