[AArch64] Add ARMv8.2 command line option and feature flag.

[Marcus Shawcroft]

On 18 November 2015 at 11:25, Matthew Wahab <matthew.wahab@foss.arm.com> wrote:
> Hello,
>
> ARMv8.2 is an architectural extension of ARMv8. This patch adds an
> architecture feature macro for ARMv8.2 to the binutils AArch64 target
> with GAS command line option -march=armv8.2-a.
>
> Tested aarch64-none-linux-gnu with cross-compiled check-binutils and
> check-gas. Checked the HTML documentation in Firefox.
>
> Ok for trunk?
> Matthew
>
> gas/
> 2015-11-18  Matthew Wahab  <matthew.wahab@arm.com>
>
>         * config/tc-aarch64.c (aarch64_archs): Add "armv8.2-a".
>         * doc/c-aarch64.texi (-march): Likewise.
>
> include/opcode/
> 2015-11-18  Matthew Wahab  <matthew.wahab@arm.com>
>
>         * aarch64.h (AARCH64_FEATURE_V8_2): New.
>         (AARCH64_ARCH_V8_2): New.

OK for trunk.

Tristan, can we backport this to 2.26 please?

Thanks
/Marcus