Fix missing indexing data when using Self initializer

Fixes: https://github.com/apple/swift/issues/64686

include/swift/AST/ASTWalker.h

@@ -48,6 +48,7 @@ struct ReferenceMetaData {
   SemaReferenceKind Kind;
   llvm::Optional<AccessKind> AccKind;
   bool isImplicit = false;
+  bool isImplicitCtorType = false;
 
   /// When non-none, this is a custom attribute reference.
   Optional<std::pair<const CustomAttr *, Decl *>> CustomAttrRef;