[Bug testsuite/68776] [6 regression] gcc.dg/vect/vect-widen-mult-const-[su]16.c failures since r226675

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68776

--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Yep.  I'll verify the fix and commit today if all goes well.  Thanks for the
investigation!