x86: Prepare `strrchr-evex` and `strrchr-evex512` for AVX10

[Sunil Pandey]

On Wed, Nov 1, 2023 at 11:44 PM Florian Weimer <fw@deneb.enyo.de> wrote:

> * Noah Goldstein:
>
> > Okay bug is missing VBMI2 check. But the VBMI2 stuff
> > isn't really needed so will update and repost w/ fixed ISA.
>
> Thanks.  The missing check explains why I couldn't reproduce it on the
> lab machines I tried, which must have had VBMI2.  The Fedora builders
> apparently don't.
>

I would like to backport this patch to release branches.
Any comments or objections?

--Sunil
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