Jordan Rose c3b23aa848 Error if an anonymous DiagGroup is referenced multiple times.
Not only is this inefficient for TableGen, it's annoying for maintenance
when renaming warning flags (unusual) or adding those flags to a group
(more likely).

This uses the new fix-it infrastructure for LLVM's SourceMgr/SMDiagnostic,
as well as a few changes to TableGen to track more source information.

llvm-svn: 172087
2013-01-10 18:50:46 +00:00

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