[Bug libstdc++/78113] std::variant and std::visit's current implementations do not get optimized out (compared to "recursive visitation")

[quicknir at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78113

--- Comment #5 from Nir Friedman <quicknir at gmail dot com> ---
Jonathan, I saw you just change the status of this. Michael Park's and I work
has resulted in a different implementation of std::visit which has much better
codegen; also backed by performance numbers. This also improves perf for things
like comparison, since internally this uses the same mechanisms. We've actually
been trying to contact someone from clang and gcc standard libraries about this
for a while to no success... please feel free to email me at quicknir@gmail.com
to get the convo going about how to maybe merge some of that code in. Happy to
help with the actual merging work as well.