[Bug c++/94175] [10 Regression] Passing constexpr empty class variable to function since r10-599

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94175

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But for #c1 it is just a missed-optimization, while if the passing of a
constexpr var to a function isn't an ODR use, isn't it then a standard
violation that we aren't optimizing the variable read into its value?