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

[Hans Wennborg]

Hi rnk,

This shouldn't really be allowed, but it comes up in real code (see PR20746), and as long as the decl hasn't been used there's no technical difficulty in supporting it, so we can just downgrade the error to a warning.

http://reviews.llvm.org/D5087

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