[Bug rtl-optimization/64286] Redundant extend removal ignores vector element type

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64286

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 34420
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34420&action=edit
gcc5-pr64286.patch

Full patch I'm going to bootstrap/regtest.