[Test] Disable Concurrency/Runtime/async.swift

rdar://79670222

Author: rintaro

test/Concurrency/Runtime/async.swift

@@ -1,3 +1,4 @@
+// REQUIRES: rdar79670222
 // RUN: %target-run-simple-swift(-Xfrontend -enable-experimental-concurrency -Xfrontend -disable-availability-checking %import-libdispatch)
 
 // REQUIRES: executable_test
@@ -7,9 +8,6 @@
 // rdar://76038845
 // UNSUPPORTED: use_os_stdlib
 
-// rdar://79670222 : This test fails on iphonesimulator-x86_64
-// UNSUPPORTED: OS=ios && CPU=x86_64
-
 import Dispatch
 import StdlibUnittest