rustc_lint_defs: Eliminate the dependency on `rustc_hir` for `Namespace`

`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`

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_resolve/src/ident.rs b/compiler/rustc_resolve/src/ident.rs
index c1b3aff4e69..650154d586f 100644
--- a/compiler/rustc_resolve/src/ident.rs
+++ b/compiler/rustc_resolve/src/ident.rs
@@ -528,7 +528,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                                         orig_ident.span,
                                         BuiltinLintDiag::ProcMacroDeriveResolutionFallback {
                                             span: orig_ident.span,
-                                            ns,
+                                            ns_descr: ns.descr(),
                                             ident,
                                         },
                                     );