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`rustc_lint_defs` uses `rustc_hir` solely for the `Namespace` type, which it only needs the static description from. Use the static description directly, to eliminate the dependency on `rustc_hir`. This reduces a long dependency chain: - Many things depend on `rustc_errors` - `rustc_errors` depends on `rustc_lint_defs` - `rustc_lint_defs` depended on `rustc_hir` prior to this commit - `rustc_hir` depends on `rustc_target`