[PATCH] D10406: [libcxx] Add atomic_support.h header to src that handles needed atomic operations.

[Eric Fiselier]

1. Fix increment/decrement consistency to fix PR22803.
2. Put functions in `atomic_support.h` inside  an inline namespace.
3. Generate a build warning on MSVC when atomics aren't supported.
4. Fix bad assertion inside shared_ptr race condition test case.

I don't think we should make any attempt to support GCC and Clang versions that do not support the `__atomic*` builtins. This would limit *building* (not using) libc++ to GCC 4.7 and beyond and clang 3.3 (possible earlier). I don't have an issue with this.


http://reviews.llvm.org/D10406

Files:
  include/memory
  include/mutex
  include/thread
  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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