Remove FIXME in rustc_privacy

Author: jyn514

compiler/rustc_privacy/src/lib.rs

@@ -842,11 +842,9 @@ impl Visitor<'tcx> for EmbargoVisitor<'tcx> {
         let macro_module_def_id =
             ty::DefIdTree::parent(self.tcx, self.tcx.hir().local_def_id(md.hir_id).to_def_id())
                 .unwrap();
-        // FIXME(#71104) Should really be using just `as_local_hir_id` but
-        // some `DefId` do not seem to have a corresponding HirId.
         let hir_id = macro_module_def_id
             .as_local()
-            .and_then(|def_id| self.tcx.hir().opt_local_def_id_to_hir_id(def_id));
+            .map(|def_id| self.tcx.hir().local_def_id_to_hir_id(def_id));
         let mut module_id = match hir_id {
             Some(module_id) if self.tcx.hir().is_hir_id_module(module_id) => module_id,
             // `module_id` doesn't correspond to a `mod`, return early (#63164, #65252).