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Now that `Results` is the only impl of `ResultsVisitable`, the trait can
be removed. This simplifies things by removining unnecessary layers of
indirection and abstraction.
- `ResultsVisitor` is simpler.
- Its type parameter changes from `R` (an analysis result) to the
simpler `A` (an analysis).
- It no longer needs the `Domain` associated type, because it can use
`A::Domain`.
- Occurrences of `R` become `Results<'tcx, A>`, because there is now
only one kind of analysis results.
- `save_as_intervals` also changes type parameter from `R` to `A`.
- The `results.reconstruct_*` method calls are replaced with
`results.analysis.apply_*` method calls, which are equivalent.
- `Direction::visit_results_in_block` is simpler, with a single generic
param (`A`) instead of two (`D` and `R`/`F`, with a bound connecting
them). Likewise for `visit_results`.
- The `ResultsVisitor` impls for `MirBorrowCtxt` and
`StorageConflictVisitor` are now specific about the type of the
analysis results they work with. They both used to have a type param
`R` but they weren't genuinely generic. In both cases there was only a
single results type that made sense to instantiate them with.
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