[GCC 10] aarch64: Add support for -mcpu=neoverse-v2

[Kyrylo Tkachov via Gcc-patches]

Hi all,

This is a GCC 10 version of 
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/602105.html
There are no tuning structures to rename so the patch is (even) smaller than 
the GCC 12 and trunk
versions.

Bootstrapped and tested on aarch64-none-linux-gnu.
Pushing to trunk.
Thanks,
Kyrill

gcc/ChangeLog:

        * config/aarch64/aarch64-cores.def (neoverse-v2): New entry.
        * config/aarch64/aarch64-tune.md: Regenerate.
        * doc/invoke.texi (AArch64 Options): Document neoverse-v2.

v2-10.patch
Description: v2-10.patch