Register group proposal

[Andrew Cagney]

Keith Seitz wrote:
> 
> On Thu, 22 Feb 2001, Andrew Cagney wrote:
> 
> > To add to this, there are two classes of iterators:
> >
> >       o       nasty ones where where you're
> >               doing a transformation.  Vis:
> >
> >               for everything in the old group
> >                  if blah
> >                     it stays in the group
> >                  else
> >                     it is removed from the group
> >
> >               breakpoints have this problem but
> >               per my other comment that is a very
> >               separate problem to what is happening
> >               here.
> 
> Are you tempting me with user-defined groups?

Why not? A reggroup is just a list of regnums.  No reason for that list
to be static.
Hmm, perhaphs in the second iteration.

	Andrew