[PATCH][GAS] aarch64: Add atomic 64-byte load/store instructions for Armv8.7

[Przemyslaw Wirkus]

> Hi Przemyslaw,
> 
> > gas/ChangeLog:
> >
> > 2020-10-29  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>
> >
> > 	* NEWS: Update docs.
> > 	* config/tc-aarch64.c: Add +ls64 feature to -march flags set.
> > 	* testsuite/gas/aarch64/ls64-invalid.d: New test.
> > 	* testsuite/gas/aarch64/ls64-invalid.l: New test.
> > 	* testsuite/gas/aarch64/ls64-invalid.s: New test.
> > 	* testsuite/gas/aarch64/ls64.s: New test.
> >
> > include/ChangeLog:
> >
> > 2020-10-29  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>
> >
> > 	* opcode/aarch64.h (AARCH64_FEATURE_LS64): New +ls64 feature
> flag.
> > 	(AARCH64_ARCH_V8_7): Add LS64 as part of Armv8.7-a.
> >
> > opcodes/ChangeLog:
> >
> > 2020-10-29  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>
> >
> > 	* aarch64-tbl.h (QL_X2NIL): New qualifier for 64-byte stores.
> > 	(LS64): Handler with +ls64 feature flags.
> > 	(_LS64_INSN): New instruction group macro.
> > 	(struct aarch64_opcode): Add LS64 instructions.
> > 	* aarch64-asm-2.c: Regenerated.
> > 	* aarch64-dis-2.c: Regenerated.
> > 	* aarch64-opc-2.c: Regenerated.
> >
> 
> Approved - please apply.

commit fd65497db4098140490e59e3dbf4709da5536081

> Cheers
>   Nick