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

[Stephen Lin]

> I appreciate that you did due diligence when designing it before sending it
> out. However, doing that design behind closed doors makes it unclear which
> objections have been raised or which concerns have been considered.

I mentioned this to you off-list but I wanted to repeat in for other
reader's benefit: the fact that this was discussed primarily off-list
is entirely my fault and due to the fact that I was a novice
contributor, not yet affiliated with Apple, and not yet aware of the
importance of discussing things on the list.

Just wanted to make that clear :)

Stephen