[DO NOT COMMIT] Use C++11 alignof/alignas everywhere.

third_party/WebKit/Source/wtf/Alignment.h

 /*
  *  Copyright (C) 2005, 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
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Library General Public License for more details.
  *
  *  You should have received a copy of the GNU Library General Public License
  *  along with this library; see the file COPYING.LIB.  If not, write to
  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  *  Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef WTF_Alignment_h
 #define WTF_Alignment_h
 
 #include <algorithm>
 #include <stdint.h>
 #include <utility>
 
 namespace WTF {
 
+#define WTF_ALIGN_OF(type) alignof(type)
 #if COMPILER(GCC)
-#define WTF_ALIGN_OF(type) __alignof__(type)
 #define WTF_ALIGNED(variable_type, variable, n) variable_type variable __attribute__((__aligned__(n)))
 #elif COMPILER(MSVC)
-#define WTF_ALIGN_OF(type) __alignof(type)
 #define WTF_ALIGNED(variable_type, variable, n) __declspec(align(n)) variable_type variable
 #else
 #error WTF_ALIGN macros need alignment control.
 #endif
 
 #if COMPILER(GCC)
 typedef char __attribute__((__may_alias__)) AlignedBufferChar;
 #else
 typedef char AlignedBufferChar;
 #endif
@@ skipping 16 matching lines @@
 
 template <uintptr_t mask>
 inline bool isAlignedTo(const void* pointer)
 {
     return !(reinterpret_cast<uintptr_t>(pointer) & mask);
 }
 
 } // namespace WTF
 
 #endif // WTF_Alignment_h