[Bug tree-optimization/117385] Move phiopt away from doing a COND_EXPR with a comparison as first operand

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117385

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note fold_build_cond_expr in tree-ifconv.cc also does this same thing. Though
in that case we won't need the comparison afterwards.