[PATCH] [libcxxabi] On single threaded systems, turn mutexes into nops

[Jon Roelofs]

Restructure cxa_exception_storage.cpp changes per kledzik's review comments.
Restructure cxa_guard.cpp similarly to make things tidier there too.

Nick, thanks for the helpful explanation on __cxa_get_globals_fast() behavior & history!

http://reviews.llvm.org/D3386

Files:
  src/config.h
  src/cxa_exception.cpp
  src/cxa_exception_storage.cpp
  src/cxa_guard.cpp
  src/fallback_malloc.ipp
  test/test_exception_storage.cpp
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