[Bug tree-optimization/58135] [x86] Missed opportunities for partial SLP

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58135

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Should be handled via the code we already have for splitting groups into
vector-sized pieces.