Cheaper thread-safe atomic initialization of static references.

Source/wtf/unicode/icu/CollatorICU.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 29 matching lines @@
 #if OS(MACOSX)
 #include "wtf/RetainPtr.h"
 #include <CoreFoundation/CoreFoundation.h>
 #endif
 
 namespace WTF {
 
 static UCollator* cachedCollator;
 static Mutex& cachedCollatorMutex()
 {
-    AtomicallyInitializedStatic(Mutex&, mutex = *new Mutex);
+    AtomicallyInitializedStaticReference(Mutex, mutex, new Mutex);
     return mutex;
 }
 
 Collator::Collator(const char* locale)
     : m_collator(0)
     , m_locale(locale ? strdup(locale) : 0)
     , m_lowerFirst(false)
 {
 }
 
@@ skipping 76 matching lines @@
     {
         Locker<Mutex> lock(cachedCollatorMutex());
         if (cachedCollator)
             ucol_close(cachedCollator);
         cachedCollator = m_collator;
         m_collator  = 0;
     }
 }
 
 } // namespace WTF