[PATCH] [libcxx] Add atomic_support.h header to src that handles needed atomic operations.

[Eric Fiselier]

Remove the `__atomic` header and put the contents in the source files. Enforce that we have atomics when building libc++.


http://reviews.llvm.org/D10406

Files:
  include/memory
  include/mutex
  src/memory.cpp
  src/mutex.cpp
  src/support/atomic_support.h
  test/libcxx/utilities/memory/util.smartptr/race_condition.pass.cpp

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