Add type inference of annotations.

pkg/front_end/testcases/inference/downwards_inference_annotations_locals.dart

Index: pkg/front_end/testcases/inference/downwards_inference_annotations_locals.dart
diff --git a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart b/pkg/front_end/testcases/inference/downwards_inference_annotations_locals.dart
similarity index 68%
copy from pkg/front_end/testcases/inference/downwards_inference_annotations.dart
copy to pkg/front_end/testcases/inference/downwards_inference_annotations_locals.dart
index fd31916c8fdba60cc4e6fb865ba35525d4a952b5..97896c70718087d2e93fd84273a9500e03a0efaa 100644
--- a/pkg/front_end/testcases/inference/downwards_inference_annotations.dart
+++ b/pkg/front_end/testcases/inference/downwards_inference_annotations_locals.dart
@@ -7,11 +7,14 @@ library test;
 
 class Foo {
   const Foo(List<String> l);
-  const Foo.named(List<String> l);
 }
 
-@Foo(/*@typeArgs=String*/ const [])
-class Bar {}
+void test() {
+  @Foo(/*@typeArgs=String*/ const [])
+  var /*@type=dynamic*/ x;
 
-@Foo.named(/*@typeArgs=String*/ const [])
-class Baz {}
+  @Foo(/*@typeArgs=String*/ const [])
+  void f() {}
+}
+
+main() {}