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.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172087 91177308-0d34-0410-b5e6-96231b3b80d8
Diagnostics: name all implicit groups used more than once.

This will be a new style requirement going forwards: a diagnostic can only
use the implicit InGroup<DiagGroup<"foo">> syntax if "foo" is not used by
any other diagnostics; as soon as it is, it needs an explicit group.

This also brings some stray "conversion" diagnostics into the
"Value Conversion Issue" category, instead of the more generic
"Semantic Issue" category. I consider this an improvement!
- warn_impcast_complex_scalar
- warn_impcast_float_integer
- warn_impcast_float_precision
- warn_impcast_integer_precision
- warn_impcast_vector_scalar

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172088 91177308-0d34-0410-b5e6-96231b3b80d8