[Bug tree-optimization/68823] [6/7 Regression][graphite] tramp3d-v4 compiled with -floop-nest-optimize crashes

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68823

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
And I'm also trying to reduce a self-contained test-case.