[Bug tree-optimization/88786] Expand vector copysign (and xorsign) operations in the vectoriser

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88786

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think it's a bit too low-level and having the higher-level op benefits
later optimizations (match.pd patterns, etc.)