[Bug c++/93901] [10 Regression] noexcept specifier on ctor does not work with constexpr variable or expression since r10-4394

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93901

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It is the
* pt.c (maybe_instantiate_noexcept): Only update clones if we
instantiated.
part of that commit that breaks this, but I'm afraid I have no idea why.