[PATCH] Removing the static initializer in ManagedStatic.cpp by using llvm_call_once to initialize the ManagedStatic mutex.

[Chris Bieneman]

Went back to the hand-rolled non-std::atomic version due to issues Reid pointed out.

http://reviews.llvm.org/D5922

Files:
  include/llvm/Support/Threading.h
  lib/Support/CMakeLists.txt
  lib/Support/ManagedStatic.cpp
  lib/Support/Threading.cpp
  lib/Support/Unix/Threading.inc
  lib/Support/Windows/Threading.inc
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