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Track what drop obligations are established on match arms.
This is accomplished by: 1. Add `MatchMode` enum to `expr_use_visitor`. 2. Computing the match mode for each pattern via a pre-pass, and then passing the mode along when visiting the pattern in expr_use_visitor. 3. Adding a `fn matched_pat` callback to expr_use_visitor, which is called on interior struct and enum nodes of the pattern (as opposed to `fn consume_pat`, which is only invoked for identifiers at the leaves of the pattern), and invoking it accordingly. Of particular interest are the `cat_downcast` instances established when matching enum variants.
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