Rollup merge of #118715 - davidtwco:issue-117997-privacy-visit-trait-ref-and-args, r=TaKO8Ki

privacy: visit trait def id of projections

Fixes #117997.

A refactoring in #117076 changed the `DefIdVisitorSkeleton` to avoid calling `visit_projection_ty` for `ty::Projection` aliases, and instead just iterate over the args - this makes sense, as `visit_projection_ty` will indirectly visit all of the same args, but in doing so, will also create a `TraitRef` containing the trait's `DefId`, which also gets visited. The trait's `DefId` isn't visited when we only visit the arguments without separating them into `TraitRef` and own args first.

Eventually this influences the reachability set and whether a function is encoded into the metadata.

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