[Bug libstdc++/90943] Visiting inherited variants no longer works in 9.1

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90943

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Corrected URL for downstream fix:
https://gitlab.com/jonathan-wakely/gcc/-/commit/486d89e403a18ef78f05f2efb1bc86bbd396899c