https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126991
--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> --- gen_phi_on_cond needs to pass down to gen_kids that it was on a gcond. gen_kids needs to pass that down to gen_kids_1. and then gen_kids_1 needs to stop outputting the `case SSA_NAME`.
