smoke: support named argument in annotations

pkg/smoke/test/common.dart

Index: pkg/smoke/test/common.dart
diff --git a/pkg/smoke/test/common.dart b/pkg/smoke/test/common.dart
index eaffd2584c762494ba3f053d16f988e6d5e9f62d..f8ce624f235c4c494f876b528890d715368832a9 100644
--- a/pkg/smoke/test/common.dart
+++ b/pkg/smoke/test/common.dart
@@ -370,6 +370,7 @@ class F2 extends F {}
 
 class Annot { const Annot(); }
 class AnnotB extends Annot { const AnnotB(); }
+class AnnotC { const AnnotC({bool named: false}); }
 const a1 = const Annot();
 const a2 = 32;
 const a3 = const AnnotB();
@@ -389,3 +390,8 @@ class H extends G {
   @a2 int h;
   @a3 int i;
 }
+
+class K {
+  @AnnotC(named: true) int k;
+  @AnnotC() int k2;
+}