[Bug tree-optimization/64731] vector lowering should split loads and stores

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64731

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Doesn't look like a regression, I see roughly same code quality all the way
from 4.1 which I tried first to current trunk.