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

[Chris Bieneman]

This update has the following changes:

* Based on discussions about the avaialability of <mutex> I've removed the pthread implementation and all the autoconf/cmake associated changes.
* Moved away from macros to a template implementation
* All platforms other than MingW32 use std::call_once, MingW32 uses the hand-rolled solution.

http://reviews.llvm.org/D5473

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