WIP: Compute constant expressions in resolution.

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

Index: pkg/compiler/lib/src/serialization/constant_serialization.dart
diff --git a/pkg/compiler/lib/src/serialization/constant_serialization.dart b/pkg/compiler/lib/src/serialization/constant_serialization.dart
index 3af1b4fa998fa42c7a3634227106c2b20051d1f1..afb9c3f5c59784f14a050c5616f037e2cefe275e 100644
--- a/pkg/compiler/lib/src/serialization/constant_serialization.dart
+++ b/pkg/compiler/lib/src/serialization/constant_serialization.dart
@@ -358,6 +358,11 @@ class ConstantConstructorSerializer
     encoder.setConstant(Key.CONSTRUCTOR,
         constructor.thisConstructorInvocation);
   }
+
+  @override
+  visitErroneous(ErroneousConstantConstructor constructor, ObjectEncoder arg) {
+    // Nothing to add; the kind has been serialized.
+  }
 }
 /// Utility class for deserializing [ConstantConstructor]s.
 ///
@@ -428,6 +433,8 @@ class ConstantConstructorDeserializer {
       case ConstantConstructorKind.REDIRECTING_FACTORY:
         return new RedirectingFactoryConstantConstructor(
             readConstructorInvocation());
+      case ConstantConstructorKind.ERRONEOUS:
+        return const ErroneousConstantConstructor();
     }
   }
 }