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

[Jon Roelofs]

Hi mclow.lists,

This is one of several pieces needed for bare-metal ARM support.

http://reviews.llvm.org/D3386

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