[PATCH][GCC] aarch64: add armv9-a to -march

[Przemyslaw Wirkus via Gcc-patches]

Patch is adding new command line option 'armv9-a' to -march.

OK for master?

gcc/ChangeLog:

2021-09-22  Przemyslaw Wirkus  <przemyslaw.wir...@arm.com>

        * config/aarch64/aarch64-arches.def (AARCH64_ARCH): Added
        armv9-a.
        * config/aarch64/aarch64.h (AARCH64_FL_V9): New.
        (AARCH64_FL_FOR_ARCH9): New flags for Armv9-A.
        (AARCH64_ISA_V9): New ISA flag.

rb14821.patch
Description: rb14821.patch