[Bug c/122650] Redeclarations of functions which add noreturn attributes should be diagnosed

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122650

--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
This is Semantics, not Constraints, so no diagnostic is required.