[PATCH] Consistency for type_tag_for_datatype subject

[Aaron Ballman]

Attr.td claims that type_tag_for_datatype only applies to VarDecl
subjects, but SemaDeclAttr.cpp was not checking for any subject
whatsoever. This patch makes SemaDeclAttr.cpp check for the proper
subject, and adds a testcase for it. However, since I couldn't find
documentation on this attribute, I wasn't certain whether this was the
correct approach, or whether Attr.td had the incorrect subject.

~Aaron
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