[Bug testsuite/69007] [6 regression] test cases gcc.dg/vect/vect-reduc-dot-s8a.c fails starting with r231815

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69007

--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
I just tried the experiment with swapping the two patterns, and it does indeed
solve the problem.