Don't call dinvoke on Object methods

lib/runtime/dart/isolate.js

 var isolate;
 (function(exports) {
   'use strict';
   class Capability extends core.Object {
     Capability() {
       return new _isolate_helper.CapabilityImpl();
     }
   }
   class IsolateSpawnException extends core.Object {
     IsolateSpawnException(message) {
@@ skipping 167 matching lines @@
       return new _isolate_helper.RawReceivePortImpl(handler);
     }
   }
   class _IsolateUnhandledException extends core.Object {
     _IsolateUnhandledException(message, source, stackTrace) {
       this.message = message;
       this.source = source;
       this.stackTrace = stackTrace;
     }
     toString() {
-      return 'IsolateUnhandledException: exception while handling message: ' + `${this.message} \n  ` + `${dart.dinvoke(dart.dinvoke(this.source, 'toString'), 'replaceAll', "\n", "\n  ")}\n` + 'original stack trace:\n  ' + `${this.stackTrace.toString().replaceAll("\n", "\n  ")}`;
+      return 'IsolateUnhandledException: exception while handling message: ' + `${this.message} \n  ` + `${this.source.toString().replaceAll("\n", "\n  ")}\n` + 'original stack trace:\n  ' + `${this.stackTrace.toString().replaceAll("\n", "\n  ")}`;
     }
   }
   _IsolateUnhandledException[dart.implements] = () => [core.Exception];
   let _description = Symbol('_description');
   class RemoteError extends core.Object {
     RemoteError(description, stackDescription) {
       this[_description] = description;
       this.stackTrace = new _RemoteStackTrace(stackDescription);
     }
     toString() {
@@ skipping 13 matching lines @@
   _RemoteStackTrace[dart.implements] = () => [core.StackTrace];
   // Exports:
   exports.Capability = Capability;
   exports.IsolateSpawnException = IsolateSpawnException;
   exports.Isolate = Isolate;
   exports.SendPort = SendPort;
   exports.ReceivePort = ReceivePort;
   exports.RawReceivePort = RawReceivePort;
   exports.RemoteError = RemoteError;
 })(isolate || (isolate = {}));