Track fields which are known to be always set to integer constants

lib/compiler/implementation/enqueue.dart

Index: lib/compiler/implementation/enqueue.dart
diff --git a/lib/compiler/implementation/enqueue.dart b/lib/compiler/implementation/enqueue.dart
index a064a6bdfa27dbc6a415e7d89ae9228946b55889..b672eef18b419540740b6f242a35866257e607e3 100644
--- a/lib/compiler/implementation/enqueue.dart
+++ b/lib/compiler/implementation/enqueue.dart
@@ -302,11 +302,12 @@ class Enqueuer {
     });
   }
 
-  void registerFieldSetter(SourceString setterName, Type type) {
+  void registerFieldSetter(SourceString setterName, Type type, bool isInteger) {
     task.measure(() {
       registerNewSelector(setterName,
                           new TypedSelector(type, Selector.SETTER),
                           universe.fieldSetters);
+      universe.updateFieldIntegerSetters(type, setterName, isInteger);
     });
   }