[Bug c/91113] add declare_simd_variant attribute support

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91113

nsz at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #1 from nsz at gcc dot gnu.org ---
i think this will have to be done differently (the attribute syntax).