[PATCH] Replacing one diagnostic with another

[Aaron Ballman]

The err_attribute_not_string error seems like it can be subsumed by
the err_attribute_argument_n_type diagnostic; the main difference
between the two being that the latter specifies an argument position
while the former does not.

This patch performs the replacement, but I wanted to make sure it was
acceptable.  If the consensus is that this is fine, I will commit a
separate patch that does the same for err_attribute_argument_not_int.

~Aaron
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