Make body_owned_by return the body directly.

Almost all callers want this anyway, and now we can use it to also return fed bodies

src/librustdoc/core.rs

@@ -284,9 +284,9 @@ pub(crate) fn create_config(
                 }
 
                 let hir = tcx.hir();
-                let body = hir.body(hir.body_owned_by(def_id));
+                let body = hir.body_owned_by(def_id);
                 debug!("visiting body for {def_id:?}");
-                EmitIgnoredResolutionErrors::new(tcx).visit_body(body);
+                EmitIgnoredResolutionErrors::new(tcx).visit_body(&body);
                 (rustc_interface::DEFAULT_QUERY_PROVIDERS.typeck)(tcx, def_id)
             };
         }),