[RFC] IPA constant propagation - very preliminary code

[Razya Ladelsky]

> Can you not put this in a a separate header?  It has nothing to
> do with the call graph as such, so...
>
> Also, Honza/me have plans to split up the call graph code more
> properly.  I have a cgraphanal.c in my local tree (doing the top
> sort and finding SCCs in the call graph), it's nice if you could
> put your jump functions in a separate header too (ipa-prop.h?
>
> Gr.
> Steven

Sure, we will put these in a separate header.

Razya