[PATCH] Improve debugging output when there is a null function pointer in the IR dump.

[Chandler Carruth]

On Wed, Jul 2, 2014 at 11:45 AM, Philip Reames <listmail at philipreames.com>
wrote:

> Given the purpose of this pass, would simply skipping the null node
> entirely be clearer?


I think it could well be useful when working on the pass to observe where
slots are null, so I'm inclined to dump more information even if it is
semantically irrelevant.
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