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

[marxin at gcc dot gnu.org]

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

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 40958
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40958&action=edit
Candidate untested patch

I'm sending candidate patch. Can you please Roland tell me where we distinguish
which messages are going to be translated and ones that not?