Expect the impossible

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@94425 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/CIndex/CIndex.cpp b/tools/CIndex/CIndex.cpp
index c9c6c25..eb40b7f 100644
--- a/tools/CIndex/CIndex.cpp
+++ b/tools/CIndex/CIndex.cpp
@@ -362,7 +362,7 @@
     return VisitChildren(Cursor);
   }
 
-  llvm_unreachable("Silly GCC, we can't get here");
+  return false;
 }
 
 /// \brief Visit the children of the given cursor.