spin less in mpsc::SyncSender::send

Author: ibraheemdev

library/std/src/sync/mpmc/array.rs

@@ -330,7 +330,7 @@ impl<T> Channel<T> {
                 if backoff.is_completed() {
                     break;
                 } else {
-                    backoff.snooze();
+                    backoff.spin();
                 }
             }