Cheaper thread-safe atomic initialization of static references.

Source/wtf/CryptographicallyRandomNumber.cpp

Index: Source/wtf/CryptographicallyRandomNumber.cpp
diff --git a/Source/wtf/CryptographicallyRandomNumber.cpp b/Source/wtf/CryptographicallyRandomNumber.cpp
index 285a5c95a9e31d312d5802416195d0875d884a0c..a25363d5207d39e24074184f03ef5698d95bdf67 100644
--- a/Source/wtf/CryptographicallyRandomNumber.cpp
+++ b/Source/wtf/CryptographicallyRandomNumber.cpp
@@ -165,8 +165,8 @@ void ARC4RandomNumberGenerator::randomValues(void* buffer, size_t length)
 
 ARC4RandomNumberGenerator& sharedRandomNumberGenerator()
 {
-    AtomicallyInitializedStatic(ARC4RandomNumberGenerator*, randomNumberGenerator = new ARC4RandomNumberGenerator);
-    return *randomNumberGenerator;
+    AtomicallyInitializedStaticReference(ARC4RandomNumberGenerator, randomNumberGenerator, new ARC4RandomNumberGenerator);
+    return randomNumberGenerator;
 }
 
 }