[Bug tree-optimization/71881] [4.9/6/7 Regression] ICE on valid code at -O3 with -g enabled on x86_64-linux-gnu: cannot update SSA form

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71881

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is during ldist, destroy_loop removes a loop which contains a PHI that is
used by a debug stmt used after the loop, and during
rewrite_into_loop_closed_ssa this is detected and ICEs.