[PATCH][GAS] aarch64: add armv9-a architecture to -march

[Nick Clifton]

Hi Przemyslaw,

> 2021-09-20  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> 
> 	* config/tc-aarch64.c: Add 'armv9-a' command line flag.
> 	* docs/c-aarch64.text: Update docs.
> 	* NEWS: Update docs.
> 
> include/
> 
> 2021-09-20  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> 
> 	* opcode/aarch64.h (AARCH64_FEATURE_V9): New define.
> 	(AARCH64_ARCH_V9): New define.

Approved  - please apply.

Cheers
   Nick