Nicholas Nethercote cae9ebbe1e Simplify Postorder customization.
`Postorder` has a `C: Customization<'tcx>` parameter, that gives it
flexibility about how it computes successors. But in practice, there are
only two `impls` of `Customization`, and one is for the unit type.

This commit simplifies things by removing the generic parameter and
replacing it with an `Option`.
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