Streamline const folding/visiting. Type folders can only modify a few "types of interest": `Binder`, `Ty`, `Predicate`, `Clauses`, `Region`, `Const`. Likewise for type visitors, but they can also visit errors (via `ErrorGuaranteed`). Currently the impls of `try_super_fold_with`, `super_fold_with`, and `super_visit_with` do more than they need to -- they fold/visit values that cannot contain any types of interest. This commit removes those unnecessary fold/visit operations, which makes these impls more similar to the impls for `Ty`. It also removes the now-unnecessary derived impls for the no-longer-visited types.
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