[Bug tree-optimization/70251] Wrong code with -O3 -march=skylake-avx512.

[ienkovich at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70251

--- Comment #6 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #5)
> I think that would be an odd transform.  But yes, The pattern is probably
> dead now and can as well be removed...

This test proves pattern is not dead and still can be applied for all
non-AVX-512 targets.  I don't think all targets make such optimizations so why
not to keep it?