[PATCH] [libcxx] Obey 29.6.5.21 for GCC.

[Dan Albert]

Hi mclow.lists, EricWF, jroelofs,

Excerpt from N3797 29.6.5.21:

> When only one memory_order argument is supplied, the value of
> success is order, and the value of failure is order except that a
> value of memory_order_acq_rel shall be replaced by the value
> memory_order_acquire and a value of memory_order_release shall be
> replaced by the value memory_order_relaxed.

Clean up some copy pasta while I'm here (someone added a return
statement to a void function).

http://reviews.llvm.org/D6632

Files:
  include/atomic
  test/atomics/atomics.general/replace_failure_order.pass.cpp

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