[Bug middle-end/85598] [7/8/9 Regression] Incorrect warning only at -O2 and -O3

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85598

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
record_ranges_from_incoming_edge does nothing here, pred_e =
single_pred_edge_ignoring_loop_edges (bb, false) is NULL.