Cheaper thread-safe atomic initialization of static references.

Source/wtf/CryptographicallyRandomNumber.cpp

 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
  * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
@@ skipping 147 matching lines @@
     stirIfNeeded();
     while (length--) {
         m_count--;
         stirIfNeeded();
         result[length] = getByte();
     }
 }
 
 ARC4RandomNumberGenerator& sharedRandomNumberGenerator()
 {
-    AtomicallyInitializedStatic(ARC4RandomNumberGenerator*, randomNumberGenerator = new ARC4RandomNumberGenerator);
-    return *randomNumberGenerator;
+    AtomicallyInitializedStaticReference(ARC4RandomNumberGenerator, randomNumberGenerator, new ARC4RandomNumberGenerator);
+    return randomNumberGenerator;
 }
 
 }
 
 
 uint32_t cryptographicallyRandomNumber()
 {
     return sharedRandomNumberGenerator().randomNumber();
 }
 
 void cryptographicallyRandomValues(void* buffer, size_t length)
 {
     sharedRandomNumberGenerator().randomValues(buffer, length);
 }
 
 }