Fix test/IRGen/async.swift when swifttailcc is disabled

Author: aschwaighofer

test/IRGen/async.swift

@@ -16,7 +16,7 @@ public class SomeClass {}
 @_silgen_name("swift_task_future_wait")
 public func task_future_wait(_ task: __owned SomeClass) async throws -> Int
 
-// CHECK: define{{.*}} swifttailcc void @"$s5async8testThisyyAA9SomeClassCnYF"(%swift.task* %0, %swift.executor* %1, %swift.context* swiftasync %2)
+// CHECK: define{{.*}} swift{{(tail)?}}cc void @"$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(
 public func testThis(_ task: __owned SomeClass) async {