Fix test case for optional swifttailcc 2nd

Author: aschwaighofer

test/IRGen/async.swift

@@ -18,7 +18,7 @@ public func task_future_wait(_ task: __owned SomeClass) async throws -> Int
 
 // CHECK: define{{.*}} swift{{(tail)?}}cc void @"$s5async8testThisyyAA9SomeClassCnYF"(%swift.task* %0, %swift.executor* %1, %swift.context* swiftasync %2)
 // CHECK-64: call swiftcc i8* @swift_task_alloc(%swift.task* %{{[0-9]+}}, i64 64)
-// CHECK: tail call swifttailcc void @swift_task_future_wait(
+// CHECK: tail call swift{{(tail)?}}cc void @swift_task_future_wait(
 public func testThis(_ task: __owned SomeClass) async {
   do {
     let _ = try await task_future_wait(task)