[clang] modified AST for SEI redemption project (PR #111705)

[Aaron Ballman via cfe-commits]

================
@@ -183,6 +199,12 @@ class TextNodeDumper
 
   void Visit(TypeLoc);
 
+  // SEI: added support for getting ReturnType information
+  void VisitReturnType(QualType T);
+
+  // SEI: added support for more QT details. it's a passthrough for this class
+  void VisitQualTypeDetails(QualType T) {}
----------------
AaronBallman wrote:

```suggestion
  void VisitReturnType(QualType T);
  void VisitQualTypeDetails(QualType T) {}
```

https://github.com/llvm/llvm-project/pull/111705