Nullability cleanups in TreeVisitor
#4547
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Adjust some of the `@Nullable` and `@NonNull` annotations in `TreeVisitor` to reduce the number of warnings in code using the API as well as in `TreeVisitor` itself.
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Adjust some of the
@Nullableand@NonNullannotations inTreeVisitorto reduce the number of warnings in code using the API as well as inTreeVisitoritself.