[Bug target/56676] unnecesary splitted load when using avx2

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56676

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-21 13:30:42 UTC ---
I believe we split unaligned loads by default because that's faster for generic
tuning.