[PATCH][GCC] aarch64: Add support for Cortex-A78C

[Przemyslaw Wirkus via Gcc-patches]

This patch adds support for -mcpu=cortex-a78c command line option.
For more information about this processor, see [0]:

[0] https://developer.arm.com/ip-products/processors/cortex-a/cortex-a78c

OK for master ?

gcc/ChangeLog:

        * config/aarch64/aarch64-cores.def (AARCH64_CORE): Add Cortex-A78C core.
        * config/aarch64/aarch64-tune.md: Regenerate.
        * doc/invoke.texi: Update docs.

rb13727.patch
Description: rb13727.patch