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

[Chris Bieneman]

Hi chandlerc, rnk, aaron.ballman, chapuni,

This patch adds an llvm_call_once which is a wrapper around std::call_once on platforms where it is available and devoid of bugs. The patch also migrates the ManagedStatic mutex to be allocated using llvm_call_once.

These changes are philosophically equivalent to the changes added in r219638, which were reverted due to a hang on Win32 which was the result of a bug in the Windows implementation of std::call_once.

http://reviews.llvm.org/D5922

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