[Bug tree-optimization/85694] Generation of vectorized AVG (Average) instruction

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85694

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so adding another pattern plus IFN would be the canonical way of
vectorizing this.