Support serialization of loadLibrary

pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart

Index: pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
diff --git a/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart b/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
index bca6d9e14de08ee0c549e061bebbe20bf5e6aadb..b5d6caee9de3b3ed6d883e066022522185bb1103 100644
--- a/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
+++ b/pkg/compiler/lib/src/serialization/resolved_ast_serialization.dart
@@ -100,6 +100,7 @@ class ResolvedAstSerializer extends Visitor {
         break;
       case ResolvedAstKind.DEFAULT_CONSTRUCTOR:
       case ResolvedAstKind.FORWARDING_CONSTRUCTOR:
+      case ResolvedAstKind.DEFERRED_LOAD_LIBRARY:
         // No additional properties.
         break;
     }
@@ -355,6 +356,8 @@ class ResolvedAstDeserializer {
         (element as AstElementMixinZ).resolvedAst =
             new SynthesizedResolvedAst(element, kind);
         break;
+      case ResolvedAstKind.DEFERRED_LOAD_LIBRARY:
+        break;
     }
   }