[RFC/patch] Callgraph based inlining heuristics

[Jan Hubicka]

> Btw. - are you currently maintaining an explicit callgraph, so we can
> stick notes to its edges?
Yes.
> 
> Just thinking about how to re-invent leafify for unit-at-a-time ;)

:)  It should not be too dificult to reinvent, just bit tricky because
it breaks the transitivity rule :( - you need to add a flag about
whether function should be leafized, add a falg to the node saying
whether it will be inlined into some leafized function and modify the
analysis accordingly.

Honza
> 
> Richard.
>