[PATCH] Handling custom subjects in Attr.td

[Aaron Ballman]

This patch demonstrates the direction I was going to go with custom
subject handling of attributes. It only handles the IBAction
attribute, as that seemed like a simple place to start.

When attempting to deduce the diagnostic argument, I am looking
through to the SubsetSubject's Base member. However, I suspect most
attributes will use the custom diagnostic logic for this.

I am only generating the custom checking code once, and reusing it
as-needed. Also, I am not attempting to support SubsetSubjects within
SubsetSubjects at this point.

~Aaron
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