[Bug c++/92171] accept incorrect access of static constexpr member when read from a reference

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92171

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Not working on this now, needs to wait till GCC 11.