[PATCH] Removing the static destructor from ManagedStatic.cpp by controlling the allocation and de-allocaation of the mutex.

[Chris Bieneman]

This revision of the patch handles the thread safe initialization concerns that were raised by Chandler and Reid. The approach to handling the thread safe initialization is the implementation of a new LLVM_CALL_ONCE macro which has implementations using C++11 call_once, pthread_once, and sys::CompareAndSwap.

The LLVM_CALL_ONCE macro could alternatively be implemented as a function taking two pointer parameters, one to the function to execute, and the other to the flag.

http://reviews.llvm.org/D5473

Files:
  cmake/config-ix.cmake
  configure
  include/llvm/Config/config.h.cmake
  include/llvm/Config/config.h.in
  include/llvm/Support/Threading.h
  lib/Support/ManagedStatic.cpp
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