Optimize %IsConstructCall() on IA-32.

src/string.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // const $String = global.String;
 // const $NaN = 0/0;
 
 
 // Set the String function and constructor.
 %SetCode($String, function(x) {
   var value = %_ArgumentsLength() == 0 ? '' : ToString(x);
-  if (%IsConstructCall()) {
+  if (%_IsConstructCall()) {
     %_SetValueOf(this, value);
   } else {
     return value;
   }
 });
 
 %FunctionSetPrototype($String, new $String());
 
 // ECMA-262 section 15.5.4.2
 function StringToString() {
@@ skipping 818 matching lines @@
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup,
     "toJSON", StringToJSON
   ));
 }
 
 
 SetupString();