[Bug tree-optimization/79302] ICE in add_loop_constraints, at graphite-sese-to-poly.c:933 building 445.gobmk

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79302

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 40635
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40635&action=edit
autoreduced testcase

This one is probably because the region has an entry loop-header -> loop-block
and an exit loop-latch -> loop-header.  So its a loop without its header.

I suppose a backedge as region exit isn't very well handled...