Vendor dependencies for 0.3.0 release

vendor/async-task/benches/spawn.rs

@@ -0,0 +1,22 @@
+#![feature(test)]
+
+extern crate test;
+
+use smol::future;
+use test::Bencher;
+
+#[bench]
+fn task_create(b: &mut Bencher) {
+    b.iter(|| {
+        let _ = async_task::spawn(async {}, drop);
+    });
+}
+
+#[bench]
+fn task_run(b: &mut Bencher) {
+    b.iter(|| {
+        let (runnable, task) = async_task::spawn(async {}, drop);
+        runnable.run();
+        future::block_on(task);
+    });
+}