https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128377
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- We are starting the region with the block with the returns-twice call but insert_seq_on_entry simply inserts there after labels. Unless we want to return to explicitly tracking region start with a gsi we have to deal with this situation by either inserting after the call (assuming we'll never vectorize it).
