Remove ConstantExpression.value

pkg/compiler/lib/src/native/enqueue.dart

Index: pkg/compiler/lib/src/native/enqueue.dart
diff --git a/pkg/compiler/lib/src/native/enqueue.dart b/pkg/compiler/lib/src/native/enqueue.dart
index 51041d535ec0c93939d9306743f82a1d4c1e3273..f1339a1b81292e37b86cc1fa6f3c0a37f1a7fdac 100644
--- a/pkg/compiler/lib/src/native/enqueue.dart
+++ b/pkg/compiler/lib/src/native/enqueue.dart
@@ -319,7 +319,8 @@ abstract class NativeEnqueuerBase implements NativeEnqueuer {
          !link.isEmpty;
          link = link.tail) {
       MetadataAnnotation annotation = link.head.ensureResolved(compiler);
-      ConstantValue value = annotation.constant.value;
+      ConstantValue value =
+          compiler.constants.getConstantValue(annotation.constant);
       if (!value.isConstructedObject) continue;
       ConstructedConstantValue constructedObject = value;
       if (constructedObject.type.element != annotationClass) continue;