[ast-optimizer-branch] Merging CFG cleanups from trunk

[Diego Novillo]

On Wed, 12 Sep 2001, Nathan Sidwell wrote:

> Diego Novillo wrote:
> > There have been some substantial changes to CFG routines in the
> > trunk that affect the tree flowgraph.
> > 
> > I'd like to merge those changes into the ast-optimizer-branch to
> > avoid future merging headaches.
> sounds like a good plan. I'm not going to have much time to do things
> on that branch in the near future, so do whatever you think is right
> 
Thanks.  I will get to it in the next few days.

Diego.