[Bug tree-optimization/83089] [8 Regression] ICE: Segmentation fault (in instantiate_scev_name)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83089

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
if-conversion fails to do a scev_reset despite DCEing stmts.  testing patch.