[Bug libstdc++/115846] std::optional> is constant expression even in C++20 mode

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115846

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think it is due to:
include/std/optional:     _GLIBCXX20_CONSTEXPR ~_Storage() { }

Which was done in r12-4389-g476f305b6cf11d (for https://wg21.link/p2231 ).