Revert "Speed up execution a bit by removing some walks"

This reverts commit a9d582f.

Author: GuillaumeGomez

src/librustdoc/visit_ast.rs

@@ -250,6 +250,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                             res,
                             ident,
                             is_glob,
+                            om,
                             please_inline,
                         ) {
                             continue;
@@ -445,26 +446,6 @@ impl<'a, 'tcx> Visitor<'tcx> for RustdocVisitor<'a, 'tcx> {
     }
 
     fn visit_mod(&mut self, _: &hir::Mod<'tcx>, _: Span, _: hir::HirId) {
-        // Handled in `visit_item_inner`
-    }
-
-    fn visit_use(&mut self, _: &hir::UsePath<'tcx>, _: hir::HirId) {
-        // Handled in `visit_item_inner`
-    }
-
-    fn visit_path(&mut self, _: &hir::Path<'tcx>, _: hir::HirId) {
-        // Handled in `visit_item_inner`
-    }
-
-    fn visit_label(&mut self, _: &rustc_ast::Label) {
-        // Unneeded.
-    }
-
-    fn visit_infer(&mut self, _: &hir::InferArg) {
-        // Unneeded.
-    }
-
-    fn visit_lifetime(&mut self, _: &hir::Lifetime) {
-        // Unneeded.
+        // handled in `visit_item_inner`
     }
 }