dart2js cps: A few extra RTI optimizations.

pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
index 9649268c4d107a9d6ba32fdcca00d6eb642d4f1b..f7c9c0ab91865099dd95c059daa345aab78246b7 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -1434,7 +1434,7 @@ class CreateInstance extends Primitive {
   /// May be `null` to indicate that no type information is needed because the
   /// compiler determined that the type information for instances of this class
   /// is not needed at runtime.
-  final Reference<Primitive> typeInformationRef;
+  Reference<Primitive> typeInformationRef;
 
   final SourceInformation sourceInformation;