[Bug middle-end/88487] union prevents autovectorization

[bugzilla@poradnik-webmastera.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88487

--- Comment #2 from Daniel Fruzynski <bugzilla@poradnik-webmastera.com> ---
I spotted that test3 in previous comment uses structure S2 which does not have
union inside. When I changes it to use S1, I got non-vectorized code. So this
workaround does not work.