[Bug c++/19502] duplicate diagnostic for invalid template constant parameter

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19502

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Since GCC 8, we produce the error message 3 times rather than the 2 times.