Try fixing dead code warnings

Author: jschwe

tokio/src/runtime/task/list.rs

@@ -157,8 +157,10 @@ impl<S: 'static> OwnedTasks<S> {
         }
     }
 
-    pub(crate) fn active_tasks_count(&self) -> usize {
-        self.inner.lock().list.count()
+    cfg_metrics! {
+        pub(crate) fn active_tasks_count(&self) -> usize {
+            self.inner.lock().list.count()
+        }
     }
 
     pub(crate) fn remove(&self, task: &Task<S>) -> Option<Task<S>> {

tokio/src/util/linked_list.rs

@@ -270,6 +270,7 @@ impl<L: Link> CountedLinkedList<L, L::Target> {
         val
     }
 
+    #[cfg(any(all(tokio_unstable, not(loom), feature = "stats"), test))]
     pub(crate) fn count(&self) -> usize {
         self.count
     }