[PATCH][AArch64][gas] Add -mcpu support for Arm Ares

[Kyrill Tkachov]

Hi all,

This adds support for the Arm Ares CPU for AArch64.
It implements the Armv8.2-A architecture with the optional features
of statistical profiling, dot product and FP16 on by default.

Note: Ares is a codename to enable early adopters and in time
we will add the final product name once it's announced.

Tested with check-gas on aarch64-none-elf

Ok for master?

Thanks,
Kyrill

2019-01-07  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/tc-aarch64.c (aarch64_cpus): Add ares.
     * doc/c-aarch64.texi (-mcpu): Document ares value.
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