[PATCH] Teach DeadArgElimination not to eliminate return values of functions with 'returned' arguments

[Stephen Lin]

> I don't object anymore. I still think you are weakening the canonical form,
> but I see the practical reasons for it.
>

Thanks!

And we can still change it if you, Nick, or anyone else comes up with
an alternative proposal and the community comes to a consensus that it
is better, no problem.

Stephen