[Bug target/80355] Improve __builtin_shuffle on AVX512F

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80355

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 51278
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51278&action=edit
gcc12-pr80355-2.patch

And this incremental patch makes it handle even similar V32HImode/V64QImode
permutations with -mavx512f -mno-avx512bw.