Move async-await tests from run-pass to ui

src/test/ui/async-await/async-fn-size.rs

@@ -1,9 +1,10 @@
+// run-pass
+
 // edition:2018
 
 #![feature(async_await)]
 
-#[path = "../auxiliary/arc_wake.rs"]
-mod arc_wake;
+extern crate arc_wake;
 
 use std::pin::Pin;
 use std::future::Future;

src/test/ui/async-await/issue-60709.rs

@@ -2,6 +2,8 @@
 // handled incorrectly in generators.
 // compile-flags: -Copt-level=z -Cdebuginfo=2 --edition=2018
 
+// run-pass
+
 #![feature(async_await)]
 #![allow(unused)]