Rollup merge of #150660 - Zalathar:pass-nodes, r=davidtwco THIR pattern building: Pass HIR nodes instead of loose types/spans This should make it easier to keep track of where the types/spans came from. There should be no change to compiler output. --- In the future I would also like to make more of these lowering methods return `Box<thir::Pat>` instead of `thir::PatKind`, so that it becomes feasible to add more fields to `thir::Pat` (e.g. for https://github.com/rust-lang/rust/pull/150498#discussion_r2652138926). That will be easier if those methods have easy access to the corresponding HIR pattern node, from which they can obtain a type and span.
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