[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 #2 from Drea Pinski <pinskia at gcc dot gnu.org> ---
I have the patch set that constifies the hooks.
the sel-sched part was easy to implement in the end once I move the IR to the
struct. The moving the IR to the cfg_hooks I think might speed up things
slightly ...

C++ification is a different story.