[Bug rtl-optimization/79856] rtl_verify_edges: use internal_error instead of error

[roland.illig at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79856

--- Comment #4 from Roland Illig <roland.illig at gmx dot de> ---
(In reply to Richard Biener from comment #3)
> So maybe we instead want a internal_error_cont () which will not end
> compilation.

I would be very happy with that.