Add NodeVisitor1 to js_ast

pkg/compiler/lib/src/js/rewrite_async.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library rewrite_async;
 
 import 'dart:collection';
 import 'dart:math' show max;
 
 import 'package:js_runtime/shared/async_await_error_codes.dart' as error_codes;
@@ skipping 345 matching lines @@
   visitStatement(js.Statement node) {
     node.accept(this);
   }
 
   /// Visits [node] to ensure its sideeffects are performed, but throwing away
   /// the result.
   ///
   /// If the return value of visiting [node] is an expression guaranteed to have
   /// no side effect, it is dropped.
   void visitExpressionIgnoreResult(js.Expression node) {
-    js.Expression result = node.accept(this);
+    // TODO(28763): Remove `<dynamic>` when issue 28763 is fixed.
+    js.Expression result = node.accept<dynamic>(this);
     if (!(result is js.Literal || result is js.VariableUse)) {
       addExpressionStatement(result);
     }
   }
 
   js.Expression visitExpression(js.Expression node) {
-    return node.accept(this);
+    // TODO(28763): Remove `<dynamic>` when issue 28763 is fixed.
+    return node.accept<dynamic>(this);
   }
 
   /// Calls [fn] with the value of evaluating [node1] and [node2].
   ///
   /// Both nodes are evaluated in order.
   ///
   /// If node2 must be transformed (see [shouldTransform]), then the evaluation
   /// of node1 is added to the current statement-list and the result is stored
   /// in a temporary variable. The evaluation of node2 is then free to emit
   /// statements without affecting the result of node1.
@@ skipping 2230 matching lines @@
     return condition || body;
   }
 
   @override
   bool visitDartYield(js.DartYield node) {
     hasYield = true;
     visit(node.expression);
     return true;
   }
 }