[Bug c++/119497] Improve diagnostic for failed assert(expr) in constexpr context

[arthur.j.odwyer at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119497

--- Comment #7 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> ---
> @jwakely is correct that on OSX/Darwin the macro is named `__assert_rtn`.

...er, sorry, the *non-constexpr function called by the `assert` macro* is
named `__assert_rtn`.