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

[Eric Fiselier]

In http://reviews.llvm.org/D10406#192279, @EricWF wrote:

> In http://reviews.llvm.org/D10406#192273, @mclow.lists wrote:
>
> > Does this patch fix: https://llvm.org/bugs/show_bug.cgi?id=22803 ?
>


Woops Misread that comment. This patch does not currently fix that bug but it can and will once I update it. The change is trivial.


http://reviews.llvm.org/D10406

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