Convert TyPolyTraitRef to accept arbitary bounds, so that things like
`Box<for<'a> Foo<&'a T> + 'a>` can be accepted. Also cleanup the visitor/fold in general, exposing more callbacks.
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`Box<for<'a> Foo<&'a T> + 'a>` can be accepted. Also cleanup the visitor/fold in general, exposing more callbacks.