[PATCH] Allow adding dll attributes on certain redecls with a warning if the decl hasn't been used yet (PR20746)

[Hans Wennborg]

Closed by commit rL216619 (authored by @hans).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5087

Files:
  cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
  cfe/trunk/lib/Sema/SemaDecl.cpp
  cfe/trunk/test/Sema/dllexport.c
  cfe/trunk/test/Sema/dllimport.c
  cfe/trunk/test/SemaCXX/dllexport.cpp
  cfe/trunk/test/SemaCXX/dllimport.cpp
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