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groundwork for better performance.
Key points:
- Separate out determining which method to use from actually selecting
a method (this should enable caching, as well as the pcwalton fast-reject strategy).
- Merge the impl selection back into method resolution and don't rely on
trait matching (this should perform better but also is needed to resolve some
kind of conflicts, see e.g. `method-two-traits-distinguished-via-where-clause.rs`)
- Purge a lot of out-of-date junk and coercions from method lookups.
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