[Bug middle-end/118758] [15 regression] ok code with -O2, but wrong code with -O3 since r15-6294

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118758

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 60386
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60386&action=edit
Slightly reduced

Still a few more steps to go but wanted to attach what I have so far.