[Bug libstdc++/96766] std::swap(std::variant, std::variant) triggers undefined behavior sanitizer

[kndevl at outlook dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96766

--- Comment #1 from Karthik Nishanth <kndevl at outlook dot com> ---
Reproducer

https://www.godbolt.org/z/Whz6ab