[Bug middle-end/50481] builtin to reverse the bit order

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50481

--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 64466
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64466&action=edit
gcc17-pr50481-2.patch

Untested second incremental patch.