Fix thinko in cleanup_tree_cfg

[Daniel Berlin]

On Fri, 2005-08-19 at 09:49 -0400, Diego Novillo wrote:
> As Jeff pointed out to me offline, when I changed
> cleanup_tree_cfg to iterate until no more cleanups were applied,
> I broke its return value.  It now returns false all the time,
> even if the flowgraph changed.
> 
> This is what caused all the speedups I got in DOM.  How
> embarrassing.  I'm testing this patch to restore the previous
> functionality.

Uh, did it cause a noticeable drop in SPEC scores, or any other
benchmark?

If not, why not just keep it that way and call it a win?

:)