Auto merge of #61276 - eddyb:kill-res-upvar, r=petrochenkov

rustc: remove Res::Upvar.

By keeping track of the current "`body_owner`" (the `DefId` of the current fn/closure/const/etc.) in several passes, `Res::Upvar` and `hir::Upvar` don't need to contain contextual information about the closure.

By leveraging [`indexmap`](https://docs.rs/indexmap), the list of upvars for a given closure can now also be queried, to check whether a local variable is a closure capture, and so `Res::Upvar` can be merged with `Res::Local`.

And finally, the `tcx.upvars(...)` query now collects upvars from HIR, without relying on `rustc_resolve`.

r? @petrochenkov cc @varkor @davidtwco

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