[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 #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
So it looks like caching in cselib_val->rtx and unwinding that via a stack
might be the fastest variant (if we care)?