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f3c8b7ad40
Some crates depend on `rustc_hir` but only want `HirId` and similar id types. `rustc_hir` is a heavy dependency, since it pulls in `rustc_target`. Split these types out into their own crate `rustc_hir_id`. This allows `rustc_errors` to drop its direct dependency on `rustc_hir`. (`rustc_errors` still depends on `rustc_hir` indirectly through `rustc_lint_defs`; a subsequent commit will fix that.)