[PATCH] Add qatomic support for AArch64 (aka arm64).

[PATCH] Add qatomic support for AArch64 (aka arm64).

Patch by Mark Salter <msalter@redhat.com>
licensed under BSD:

<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735488#195>

This patch is known to not be the most correct way
to implement them, as it seems to be possible to do it in a faster way,
but should work non the less until we can provide something better.

Change-Id: Ib392b27dc54691fd4c2ea9896240ad71fb8128cc

Gbp-Pq: Name aarch64_arm64_qatomic_support.patch