[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 #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Implemented downstream:
https://gitlab.com/jonathan-wakely/gcc/-/commit/484308ad163862632ae7e710c5d909be385450aa