[Bug target/88461] AVX512: gcc should keep value in kN registers if possible

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88461

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45219
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45219&action=edit
gcc9-pr88461-2.patch

Patch that seems to work for me (though, it adjusts just the vptest{,n}m
patterns and nothing else.