Silence a control reaches end of function warning. Patch by Enea

Zaffanella.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@93743 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/TypeLocVisitor.h

@@ -43,6 +43,7 @@ public:
     case TypeLoc::CLASS: DISPATCH(CLASS##TypeLoc);
 #include "clang/AST/TypeLocNodes.def"
     }
+    llvm_unreachable("unexpected type loc class!");
   }
 
 #define TYPELOC(CLASS, PARENT)      \