https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122016
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I am suspect this was introduced by r15-7472-g0a1d2ea57722c2 . And I suspect there is a missing check for abnormal ssa name before doing the folding and inserting the new value.
