[Bug middle-end/117871] cfg_hooks variables should be const at least and maybe a virtual functions

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117871

--- Comment #4 from Drea Pinski <pinskia at gcc dot gnu.org> ---
The constant part is done. C+ification will happen later on.