[Bug fortran/64244] [4.8/4.9/5 Regression] ICE at class.c:236 when using non_overridable

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64244

--- Comment #3 from janus at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #1)
> Likely r181107 for pr50919.

Yes, this commit (authored by myself) is definitely the culprit here.

The nontriviality in the given test case is that we have to deal with a generic
type-bound call, which is being resolved to a non-overridable type-bound call.

'resolve_typebound_generic_call' should probably communicate to its caller that
the specific procedure it found is not overridable.