[PATCH] Correcting attribute argument count errors

[Aaron Ballman]

While doing some refactoring with the way attributes are diagnosed, I
noticed that the NSObject and Overloadable attributes seemed to emit
an incorrect diagnostic.  Specifically, both would check that no
arguments were passed, but then proceed to emit a diagnostic
suggesting that an argument was required.

This patch corrects the behavior so that the diagnostic matches the
expectation, and adds test cases for both attributes.

~Aaron
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