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

[antoshkka at gmail dot com]

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

--- Comment #4 from Antony Polukhin <antoshkka at gmail dot com> ---
> Would you be willing to complete a copyright assignment for contributions to
> GCC?

Yes, I can do that. Please send the instructions to my email.