[clang] [ASTImporter] Fix infinite recurse on return type declared inside body (#68775) (PR #89096)

[Matheus Izvekov via cfe-commits]

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@@ -3649,19 +3649,15 @@ class IsTypeDeclaredInsideVisitor
 
 /// This function checks if the function has 'auto' return type that contains
 /// a reference (in any way) to a declaration inside the same function.
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mizvekov wrote:

```suggestion
/// This function checks if the given function has a return type that contains
/// a reference (in any way) to a declaration inside the same function.
```

https://github.com/llvm/llvm-project/pull/89096