dart2js cps: Set a flag on InvokeMethod when the receiver is intercepted

pkg/compiler/lib/src/js_backend/codegen/unsugar.dart

 library dart2js.unsugar_cps;
 
 import '../../cps_ir/cps_ir_nodes.dart';
 
 import '../../cps_ir/optimizers.dart' show ParentVisitor;
 import '../../constants/values.dart';
 import '../../elements/elements.dart';
 import '../../io/source_information.dart';
 import '../../js_backend/codegen/glue.dart';
 import '../../universe/universe.dart' show Selector;
@@ skipping 232 matching lines @@
       LetCont contBinding = node.parent;
       newReceiver = new Interceptor(receiver, node.sourceInformation)
           ..interceptedClasses.addAll(_glue.getInterceptedClassesOn(selector));
       if (receiver.hint != null) {
         newReceiver.hint = new InterceptorEntity(receiver.hint);
       }
       insertLetPrim(newReceiver, contBinding);
     }
     node.arguments.insert(0, node.receiver);
     node.receiver = new Reference<Primitive>(newReceiver);
+    node.receiverIsIntercepted = true;
   }
 
   processInvokeMethodDirectly(InvokeMethodDirectly node) {
     if (!_glue.isInterceptedMethod(node.target)) return;
 
     Selector selector = node.selector;
     Primitive receiver = node.receiver.definition;
     Primitive newReceiver;
 
     if (receiver == explicitReceiverParameter) {
@@ skipping 11 matching lines @@
       insertLetPrim(newReceiver, contBinding);
     }
     node.arguments.insert(0, node.receiver);
     node.receiver = new Reference<Primitive>(newReceiver);
   }
 
   processInterceptor(Interceptor node) {
     _glue.registerSpecializedGetInterceptor(node.interceptedClasses);
   }
 }