[Bug target/70354] [6 Regression] Wrong code with -O3 -march=broadwell and -march=skylake-avx512.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70354

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Also fails with -mprefer-avx128 -mavx2 (needs avx2 for integer vector shift it
seems).

Not yet spotted the actual issue we run into...