Use macros instead of specializing VectorTraits explicitly

Source/wtf/VectorTraits.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 82 matching lines @@
     };
 
 } // namespace WTF
 
 #define WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(ClassName) \
 namespace WTF { \
     template<> \
     struct VectorTraits<ClassName> : SimpleClassVectorTraits<ClassName> { }; \
 }
 
+#define WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(ClassName) \
+namespace WTF { \
+    template<> \
+    struct VectorTraits<ClassName> : VectorTraitsBase<ClassName> \
+    { \
+        static const bool canInitializeWithMemset = true; \
+        static const bool canMoveWithMemcpy = true; \
+    }; \
+}
+
 using WTF::VectorTraits;
 using WTF::SimpleClassVectorTraits;
 
 #endif // WTF_VectorTraits_h