[Bug bootstrap/64676] [5.0 Regression] SEGV in tree-ssa-structalias.c solve_constraint

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64676

--- Comment #5 from David Edelsohn <dje at gcc dot gnu.org> ---
This was caused by r219842

    PR rtl-optimization/64081
    * loop-iv.c (def_pred_latch_p): New function.
    (latch_dominating_def): Allow specific cases with non-single
    definitions.
    (iv_get_reaching_def): Likewise.
    (check_complex_exit_p): New function.
    (check_simple_exit): Use check_complex_exit_p to allow certain cases
    with exits not executing on any iteration.