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Assoc item cleanup Part 2 - Remove `AssocItem` from `RegionVariableOrigin::AutoRef` - Use the `associated_item_def_ids` query instead of the `associated_items` query when possible The change to `ObligationCauseCode` from #90639 is omitted because it caused a perf regression. r? `@cjgillot`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.