Cheaper thread-safe atomic initialization of static references.

Source/platform/heap/Visitor.cpp

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * 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
@@ skipping 30 matching lines @@
 int GCInfoTable::s_gcInfoIndex = 0;
 
 size_t GCInfoTable::s_gcInfoTableSize = 0;
 GCInfo const** s_gcInfoTable = nullptr;
 
 void GCInfoTable::ensureGCInfoIndex(const GCInfo* gcInfo, size_t* gcInfoIndexSlot)
 {
     ASSERT(gcInfo);
     ASSERT(gcInfoIndexSlot);
     // Keep a global GCInfoTable lock while allocating a new slot.
-    AtomicallyInitializedStatic(Mutex&, mutex = *new Mutex);
+    AtomicallyInitializedStaticReference(Mutex, mutex, new Mutex);
     MutexLocker locker(mutex);
 
     // If more than one thread ends up allocating a slot for
     // the same GCInfo, have later threads reuse the slot
     // allocated by the first.
     if (*gcInfoIndexSlot)
         return;
 
     int index = ++s_gcInfoIndex;
     size_t gcInfoIndex = static_cast<size_t>(index);
@@ skipping 40 matching lines @@
 #if !defined(COMPONENT_BUILD)
     // On component builds we cannot compare the gcInfos as they are statically
     // defined in each of the components and hence will not match.
     BaseHeapPage* page = pageFromObject(payload);
     ASSERT(page->orphaned() || HeapObjectHeader::fromPayload(payload)->gcInfoIndex() == gcInfoIndex);
 #endif
 }
 #endif
 
 }