RFC: Backport architecture specific improvements to release branches

[Noah Goldstein]

On Tue, Mar 29, 2022 at 12:29 PM H.J. Lu via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> 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

Given that the compiler does not emit `bzero` and we dropped the `__memsetzero`
optimization maybe best w.o:
https://gitlab.com/x86-glibc/glibc/-/commit/76e17e47789ef4faf1367b2e48c19763559c79a0
for the sake of code size.

>
> Any comments?
>
> Thanks.
>
> --
> H.J.