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

[antoshkka at gmail dot com]

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

--- Comment #1 from Antony Polukhin <antoshkka at gmail dot com> ---
Note that this bug is related to Bug 86912. Fixing Bug 86912 should
automatically resolve this issue (but not vice versa).