Fix some static member emits

lib/runtime/dart/_isolate_helper.js

 var _isolate_helper;
 (function(exports) {
   'use strict';
   // Function _serializeMessage: (dynamic) → dynamic
   function _serializeMessage(message) {
     return new _Serializer().serialize(message);
   }
   // Function _deserializeMessage: (dynamic) → dynamic
   function _deserializeMessage(message) {
     return new _Deserializer().deserialize(message);
@@ skipping 453 matching lines @@
     }
     static _serializePrintMessage(object) {
       return _serializeMessage(dart.map({command: "print", msg: object}));
     }
     maybeCloseWorker() {
       if (dart.notNull(this.isWorker) && dart.notNull(this.isolates.isEmpty) && this.topEventLoop[_activeJsAsyncCount] == 0) {
         this.mainManager.postMessage(_serializeMessage(dart.map({command: 'close'})));
       }
     }
   }
-  let _controlPort = Symbol('_controlPort');
   let _scheduledControlEvents = Symbol('_scheduledControlEvents');
   let _isExecutingEvent = Symbol('_isExecutingEvent');
   let _updateGlobalState = Symbol('_updateGlobalState');
   let _setGlobals = Symbol('_setGlobals');
   let _addRegistration = Symbol('_addRegistration');
   let _close = Symbol('_close');
   class _IsolateContext extends core.Object {
     _IsolateContext() {
       this.id = (() => {
         let o = exports._globalState, x = o.nextIsolateId;
         o.nextIsolateId = dart.notNull(x) + 1;
         return x;
       })();
       this.ports = new (core.Map$(core.int, RawReceivePortImpl))();
       this.weakPorts = new (core.Set$(core.int))();
       this.isolateStatics = _foreign_helper.JS_CREATE_ISOLATE();
-      this.controlPort = new RawReceivePortImpl[_controlPort]();
+      this.controlPort = new RawReceivePortImpl._controlPort();
       this.pauseCapability = new isolate.Capability();
       this.terminateCapability = new isolate.Capability();
       this.delayedEvents = dart.setType([], core.List$(_IsolateEvent));
       this.pauseTokens = new (core.Set$(isolate.Capability))();
       this.errorPorts = new (core.Set$(isolate.SendPort))();
       this.initialized = false;
       this.isPaused = false;
       this.doneHandlers = null;
       this[_scheduledControlEvents] = null;
       this[_isExecutingEvent] = false;
@@ skipping 877 matching lines @@
   exports.leaveJsAsync = leaveJsAsync;
   exports.isWorker = isWorker;
   exports.startRootIsolate = startRootIsolate;
   exports.IsolateNatives = IsolateNatives;
   exports.RawReceivePortImpl = RawReceivePortImpl;
   exports.ReceivePortImpl = ReceivePortImpl;
   exports.TimerImpl = TimerImpl;
   exports.hasTimer = hasTimer;
   exports.CapabilityImpl = CapabilityImpl;
 })(_isolate_helper || (_isolate_helper = {}));