[PATCH] Generate diagnostic checks for attribute subjects

[Aaron Ballman]

This patch lays the basic groundwork for table generating the
diagnostics for attribute subjects. It does this by making some
modifications to the way subjects are listed in Attr.td, and updating
the attr emitter to handle the new constructs.

I have disabled some attribute subject lines on purpose in Attr.td;
this part is a WIP with the goal being to restore those subjects
incrementally. By commenting them out, it leaves the original behavior
the same as before for those attributes and so those are not
functionality changes.

~Aaron
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