[Bug target/90763] PowerPC vec_xl_len should take const

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90763

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Bill Schmidt from comment #2)
> Whoops, that was not supposed to go to bz.  Sorry about that.

Hehe. Sure, I'll do it next time.