[Bug c++/92496] spaceship operator without include produces ICE

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92496

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Slightly reduced:

template<auto V>
struct A {};

struct B {
    constexpr auto operator<=>(const B&) const = default;
    int value;
};

A<B{}> t;