[Bug tree-optimization/66101] [5/6 Regression] internal compiler error: in verify_loop_structure, at cfgloop.c:1662

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66101

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's DCE leaving loops broken and not marking them for fixup.