[Bug tree-optimization/115993] `((A&B)^C)^B` or `(~A & B) ^ C` is more canonical

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115993

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It is even simpler, you have to consider arity in addition to the number of
operations.