[Bug target/101985] vec_cpsgn parameter order

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101985

--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Patch posted at
https://gcc.gnu.org/pipermail/gcc-patches/2021-September/580235.html.