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

[Chris Bieneman]

Fixed code comments based on Aaron's feedback.

Aaron, I understand your point about using the Windows one-time initialization, however I'm really not the best candidate to write Windows specific code. I am much more familiar with basic threading constructs like MemFence and CompareAndSwap than Win32 APIs. Could you provide and test a Windows one-time init solution?

Thanks,
-Chris

http://reviews.llvm.org/D5922

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