[Bug tree-optimization/97098] vect_bb_slp_mark_live_stmts() loops forever on test case using -O3

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97098

--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
Added richi to CC since vect_bb_slp_mark_live_stmts() is a new function he
recently added.