[Bug c++/80294] [5/6/7 Regression] ICE with constexpr and inheritance

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80294

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
I've posted the simple patch here:
https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00132.html