https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83985
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- In the end this was really caused by r241060. Not deleting unmarked insn is a bad idea, because we might not have marked any instructions it needs, so instead we need to mark such instructions as not deletable and let the DCE pass do its magic.
