[patch] Fix PR43464: update loop closed SSA form once copy prop is done

[Sebastian Pop]

On Mon, Mar 22, 2010 at 04:52, Richard Guenther <rguenther@suse.de> wrote:
> Simply drop the gimple_num_phi_args == 1 check from the code that
> tries to preserve loop-closed SSA form.

This change passed bootstrap and test on amd64-linux.
As I said on the PR, this change would break both h264ref
and gamess with -O3.  See
http://groups.google.com/group/gcc-graphite-test/browse_thread/thread/f5b0d912e90b598f

And there I come back again to Steven, and reiterate:
instead of just adding more bugs like this, why not adding
as I proposed a call to rewrite_into_loop_closed_ssa
that would do the right thing?

Sebastian