Handle const Symbol(...) in closed_world2_test

tests/compiler/dart2js/kernel/closed_world2_test.dart

Index: tests/compiler/dart2js/kernel/closed_world2_test.dart
diff --git a/tests/compiler/dart2js/kernel/closed_world2_test.dart b/tests/compiler/dart2js/kernel/closed_world2_test.dart
index 1ad9e31c35c0efdd34d67f6072c469d00180a243..ec382da99d1beb5d353f1ce98953f32af353a754 100644
--- a/tests/compiler/dart2js/kernel/closed_world2_test.dart
+++ b/tests/compiler/dart2js/kernel/closed_world2_test.dart
@@ -89,6 +89,7 @@ main() {
   null is List<int>; // Use generic test
   method1(); // Both top level and instance method named 'method1' are live.
   #main; // Use a const symbol.
+  const Symbol('foo'); // Use the const Symbol constructor directly
   new Int8List(0); // Use redirect factory to abstract native class
 }
 '''