Add check-pass test

Author: Aaron1011

src/test/ui/async-await/generator-mir-traits.rs

@@ -0,0 +1,17 @@
+// edition:2018
+// check-pass
+
+#![feature(generator_mir_traits)]
+
+fn is_send<T: Send>(val: T) {}
+
+async fn dummy() {}
+
+async fn not_send() {
+    let val: *const ();
+    dummy().await;
+}
+
+fn main() {
+    is_send(not_send());
+}