[Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 43849
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43849&action=edit
patch

Patch I am testing.