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

[Aaron Ballman via cfe-commits]

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@@ -410,8 +447,17 @@ class ASTNodeTraverser
     Visit(T->getSizeExpr());
   }
   void VisitVectorType(const VectorType *T) { Visit(T->getElementType()); }
-  void VisitFunctionType(const FunctionType *T) { Visit(T->getReturnType()); }
+  void VisitFunctionType(const FunctionType *T) {
+    // SEI: add functionDetails, incl. return type
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AaronBallman wrote:

```suggestion
```

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