[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 #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Well the patch for PR 110155 will fix f but not g. I will add the POINTER_PLUS
pattern this weekend.