[Bug tree-optimization/97711] Failure to optimise "x & 1 ? x - 1 : x" to "x & -2"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97711

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the committed patch only fixes f in comment #1. g (Pointer plus) will need
another change.