[ClangDiagnostics] Silence warning about fallthrough after PrintFatalError

Summary:
ClangDiagnosticsEmitter.cpp:1047:57: warning: this statement may fall through [-Wimplicit-fallthrough=]
       Builder.PrintFatalError("Unknown modifier type: " + Modifier);
                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
ClangDiagnosticsEmitter.cpp:1048:5: note: here
     case MT_Select: {
                   ^

Reviewers: rsmith, rtrieu

Reviewed By: rtrieu

Subscribers: rtrieu, ilya-biryukov, ioeric, MaskRay, jkorous, cfe-commits

Differential Revision: https://reviews.llvm.org/D47340

llvm-svn: 333340

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
index fd9efd35582..6bfb3f9f61f 100644
--- a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -633,7 +633,7 @@ struct DiagnosticTextBuilder {
     return It->second.Root;
   }
 
-  void PrintFatalError(llvm::Twine const &Msg) const {
+  LLVM_ATTRIBUTE_NORETURN void PrintFatalError(llvm::Twine const &Msg) const {
     assert(EvaluatingRecord && "not evaluating a record?");
     llvm::PrintFatalError(EvaluatingRecord->getLoc(), Msg);
   }