[Bug tree-optimization/120477] arith_overflow_check_p has a special case for COND_EXPR but it is dead

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120477

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
r13-707-g68e0063397ba82 was when COND_EXPR no longer could have a conditional
in rhs1.