[Bug tree-optimization/80171] [5/6/7 Regression] ICE (Segmentation fault) with optimization

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80171

--- Comment #7 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 41046
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41046&action=edit
Somewhat reduced testcase

I've attached a testcase that is accepted by clang. GCC ICEs without
-fpermissive.