Add sanity check in Clang TableGen backend to check if 'Component' is a string.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67565 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/ClangDiagnosticsEmitter.cpp b/utils/TableGen/ClangDiagnosticsEmitter.cpp
index 0f93a4f..38bbf8e 100644
--- a/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -113,7 +113,7 @@
         continue;
 
       const StringInit* SV = dynamic_cast<const StringInit*>(V->getValue());
-      if (SV->getValue() != Component)
+      if (!SV || SV->getValue() != Component)
         continue;
     }