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

[Chris Bieneman]

Updated to have all non-MingW platforms use std::call_once, and MingW platforms use thread safe static initialization.

http://reviews.llvm.org/D5473

Files:
  include/llvm/Support/Threading.h
  lib/Support/ManagedStatic.cpp
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