[Bug c++/110401] [13/14/15/16 Regression] Unhelpful "goto is not a constant expression" in ill-formed pre c++20 constexpr function template

[ajcozzol at us dot ibm.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110401

--- Comment #6 from Anthony Cozzolino <ajcozzol at us dot ibm.com> ---
Per bug 123577, the reason given is correct for arrays 16 elements and less,
but incorrect for anything above that.

Also per comment in bug 123577, no reason is given at all on trunk.