[Bug tree-optimization/70964] [7 Regression] internal compiler error: in single_succ_edge, at basic-block.h:351

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70964

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
1736      latch_edge = single_succ_edge (get_bb_copy (loop->latch));

the fake edges make loop structure "invalid"