[Bug libstdc++/89825] Jump table for variant visitation could be shortened for never empty variants

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89825

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #2)
> Would you be willing to complete a copyright assignment for contributions to
> GCC?

And then ideally, make lots more contributions :-)