[PATCH] [libcxx] Add __atomic header that handles needed atomic operations.

[Eric Fiselier]

Hi mclow.lists,

In some places in libc++ we need to use the `__atomic_*` builtins. This patch adds a header that provides access to those builtins in a uniform way.

http://reviews.llvm.org/D10406

Files:
  include/__atomic
  include/__config
  include/memory
  include/mutex
  src/memory.cpp
  src/mutex.cpp
  test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
  test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once11.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared/race_condition.pass.cpp

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