[PATCH] [C++11] Replace LLVM atomics with std::atomic.

[Benjamin Kramer]

Hi chandlerc,

With C++11 we finally have a standardized way to specify atomic operations. Use
them to replace the existing custom implemention. Sadly the translation is not
entirely trivial as std::atomic allows more fine-grained control over the
atomicity. I tried to preserve the old semantics as well as possible.

http://llvm-reviews.chandlerc.com/D2915

Files:
  include/llvm/ADT/Statistic.h
  include/llvm/PassSupport.h
  include/llvm/Support/ManagedStatic.h
  lib/IR/Attributes.cpp
  lib/IR/DiagnosticInfo.cpp
  lib/Support/ManagedStatic.cpp
  lib/Support/Statistic.cpp
  lib/Support/Threading.cpp
  lib/Support/Timer.cpp
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