https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120704
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I think it went away with r16-6900-ge48704694d686de, but our bisect seed only has for some strange reason r16-6899 and then r16-6918 (the former still emits the 3 ubsan messages, the latter doesn't, and the first change in dumps between those two is the lim2 pass).
