[Test] Update test to be tolerant to attribute order changes

Author: xymus

test/IDE/print_ast_tc_decls.swift

@@ -547,7 +547,12 @@ class d0170_TestAvailability {
 // PASS_COMMON-LABEL: {{^}}@objc class d0180_TestIBAttrs {{{$}}
 
   @IBAction func anAction(_: AnyObject) {}
-// PASS_COMMON-NEXT: {{^}}  @objc @IBAction @MainActor func anAction(_: AnyObject){{$}}
+/// Tolerate different attribute orders to support both reading from source
+/// and deserializing from swiftmodule.
+// PASS_COMMON-NEXT: {{^}}  @objc
+// PASS_COMMON-DAG: @IBAction
+// PASS_COMMON-DAG: @MainActor
+// PASS_COMMON: func anAction(_: AnyObject){{$}}
 
   @IBSegueAction func aSegueAction(_ coder: AnyObject, sender: AnyObject, identifier: AnyObject?) -> Any? { fatalError() }
 // PASS_COMMON-NEXT: {{^}}  @objc @IBSegueAction func aSegueAction(_ coder: AnyObject, sender: AnyObject, identifier: AnyObject?) -> Any?{{$}}