[PATCH] Kill the LLVM global lock

[Zachary Turner]

Remove the global lock entirely, and bootstrap a call_once initialized' mutex in ManagedStatic that is safe for use during static construction.

http://reviews.llvm.org/D4142

Files:
  docs/ProgrammersManual.rst
  include/llvm-c/Core.h
  include/llvm/Support/ManagedStatic.h
  include/llvm/Support/Mutex.h
  include/llvm/Support/Threading.h
  lib/IR/Core.cpp
  lib/Support/ManagedStatic.cpp
  lib/Support/Threading.cpp
  lib/Support/Timer.cpp
  unittests/Support/ManagedStatic.cpp
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