[PATCH][GCC] arm: 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 from master ?

gcc/ChangeLog:

        * config/arm/arm-cpus.in: Add Cortex-A78C core.
        * config/arm/arm-tables.opt: Regenerate.
        * config/arm/arm-tune.md: Regenerate.
        * doc/invoke.texi: Update docs.

rb13728.patch
Description: rb13728.patch