[PATCH] Fix PR32586, restore combining of conversions in SCCVN

[Richard Guenther]

On Fri, 7 Sep 2007, Richard Guenther wrote:

> > >
> > > I'll change along this way and commit it if it works out.
> > 
> > Works for me :)
> 
> I reverted the SCCVN parts of the patch again because it caused bootstrap
> on i686 to fail with a miscompare.

We seem to have some wacky latent problem somewhere.  Bootstrap fails
again.  My #1 bet is always aliasing (it has been easy lately to
hide/expose bugs there because partitioning is so volatile).

Richard.