swift234

Further consolidate mutation code, this time for DeclRefExprs.  With that
done, the rest of the infrastructure is all common and can be simplified.  This
leaves us with a quite small and maintainable subsystem for diagnosing these
kinds of problems.

 include/swift/AST/DiagnosticsSema.def |   28 ++-----
 lib/Sema/CSDiag.cpp                   |  132 ++++++++++------------------------
 2 files changed, 48 insertions(+), 112 deletions(-)




Swift SVN r28957