Support typedef type literals

pkg/compiler/lib/src/kernel/env.dart

Index: pkg/compiler/lib/src/kernel/env.dart
diff --git a/pkg/compiler/lib/src/kernel/env.dart b/pkg/compiler/lib/src/kernel/env.dart
index 7ffc47166df72f505dafeb0034804792bdd8de1c..57c853b6a60bc3e4b028a7611ae2b211cde8632c 100644
--- a/pkg/compiler/lib/src/kernel/env.dart
+++ b/pkg/compiler/lib/src/kernel/env.dart
@@ -593,3 +593,11 @@ class FieldDataImpl extends MemberDataImpl implements FieldData {
     return new FieldDataImpl(node, definition);
   }
 }
+
+class TypedefData {
+  final ir.Typedef node;
+  final TypedefEntity element;
+  final TypedefType rawType;
+
+  TypedefData(this.node, this.element, this.rawType);
+}