[Bug tree-optimization/123002] [15/16 regression] WIDEN_MULT_EXPR are incorrectly vectorized since r15-3189-gd3e71b99194bff

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123002

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Oh, and the issue was introduced by r0-117751-g6ae6116f1985d4 which didn't even
add a testcase showing that we want the even/odd widening multiplication on
reductions :/