[Aarch64] Support an ARMv8.2 system register.

[Tristan Gingold]

> On 10 Dec 2015, at 16:19, Matthew Wahab <matthew.wahab@foss.arm.com> wrote:
> 
> Committed: https://sourceware.org/ml/binutils-cvs/2015-11/msg00163.html
> 
> Is this also ok for the 2.26 branch?

yes.

> Matthew
> 
> On 24/11/15 10:47, Matthew Wahab wrote:
>> Hello,
>> 
>> ARMv8.2 adds a new system register id_aa64mmfr2_el1. This patch adds
>> support for the register to binutils, making it available when
>> -march=armv8.2-a is selected.
>> 
>> Tested aarch64-none-linux-gnu with cross-compiled check-binutils and
>> check-gas.
>> 
>> Ok for trunk?
>> Matthew
>> 
>> gas/testsuite/
>> 2015-11-24  Matthew Wahab  <matthew.wahab@arm.com>
>> 
>>     * gas/aarch64/sysreg-2.d: New.
>>     * gas/aarch64/sysreg-2.s: New.
>> 
>> opcodes/
>> 2015-11-24  Matthew Wahab  <matthew.wahab@arm.com>
>> 
>>     * aarch64-opc.c (aarch64_sys_regs): Add "id_aa64mmfr2_el1".
>>     (aarch64_sys_reg_supported_p): Add ARMv8.2 system register
>>     feature test.
>