[Bug c++/112296] __builtin_constant_p doesn't propagate through member functions

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112296

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
__builtin_constant_p is limited by inlining, maybe you want to use
if constexpr for this or the standard library facility I can't remember
right now.