ArrayRef<T>() -> None cleanup

llvm-svn: 181140
diff --git a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
index 291eb75..da15c93 100644
--- a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -245,7 +245,7 @@
                             SourceMgr::DK_Error,
                             Twine("group '") + Name +
                               "' is referred to anonymously",
-                            ArrayRef<SMRange>(),
+                            None,
                             InGroupRange.isValid() ? FixIt
                                                    : ArrayRef<SMFixIt>());
         SrcMgr.PrintMessage((*I)->ExplicitDef->getLoc().front(),