Allow "dynamic" as a constant value in analyzer.

pkg/analyzer/lib/src/generated/constant.dart

Index: pkg/analyzer/lib/src/generated/constant.dart
diff --git a/pkg/analyzer/lib/src/generated/constant.dart b/pkg/analyzer/lib/src/generated/constant.dart
index c5b413d06cd8ea9387aa32f0e97afcc8f3410a6e..dab71f3420c5cb15602ea712bccd6898626e6a99 100644
--- a/pkg/analyzer/lib/src/generated/constant.dart
+++ b/pkg/analyzer/lib/src/generated/constant.dart
@@ -1628,7 +1628,9 @@ class ConstantVisitor extends UnifyingAstVisitor<DartObjectImpl> {
         }
         return new DartObjectImpl(functionType, new FunctionState(function));
       }
-    } else if (element is ClassElement || element is FunctionTypeAliasElement) {
+    } else if (element is ClassElement ||
+        element is FunctionTypeAliasElement ||
+        element is DynamicElementImpl) {
       return new DartObjectImpl(_typeProvider.typeType, new TypeState(element));
     }
     // TODO(brianwilkerson) Figure out which error to report.
@@ -5027,6 +5029,9 @@ class TypeState extends InstanceState {
   String get typeName => "Type";
 
   @override
+  Element get value => _element;
+
+  @override
   bool operator ==(Object object) =>
       object is TypeState && (_element == object._element);