RFC: Backport architecture specific improvements to release branches

[H.J. Lu]

Hi,

We'd like to backport architecture specific improvements to release branches,
similar to backports under sysdeps/x86_64/multiarch on users/intel/x86/2.34
branch:

https://gitlab.com/x86-glibc/glibc/-/commits/users/intel/x86/2.34

Any comments?

Thanks.

--
H.J.