[PATCH][GAS] aarch64: Extract Pointer Authentication feature from Armv8.3-A

[Przemyslaw Wirkus]

> Hi Przemyslaw,
> 
> > include/ChangeLog:
> > 2020-11-05  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* opcode/aarch64.h (AARCH64_FEATURE_PAC): Add new feature.
> > 	(AARCH64_ARCH_V8_3): Add back PAC to Armv8.3-A.
> >
> > opcodes/ChangeLog:
> > 2020-11-05  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* aarch64-tbl.h (PAC): Handle for PAC feature.
> > 	(PAC_INSN): New PAC instruction.
> > 	(struct aarch64_opcode):  Move PAC instructions from V8_3_INSN to
> > 	PAC_INSN.
> 
> Approved - please apply.

commit af1bd771fc1e719df4c834f9f2d12b879a9de712

> Cheers
>    Nick
>