closure fields must set isStatic

pkg/compiler/lib/src/js_model/closure.dart

 // Copyright (c) 2017, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../common/tasks.dart';
 import '../elements/entities.dart';
@@ skipping 370 matching lines @@
   final String name;
   final ir.TreeNode executableContext;
   NodeBox(this.name, this.executableContext);
 }
 
 class JClosureField extends JField {
   JClosureField(String name, int memberIndex,
       KernelClosureClass containingClass, bool isConst, bool isAssignable)
       : super(memberIndex, containingClass.library, containingClass,
             new Name(name, containingClass.library),
-            isAssignable: isAssignable, isConst: isConst);
+            isAssignable: isAssignable, isConst: isConst, isStatic: false);
 }
 
 /// A ClosureField that has been "boxed" to prevent name shadowing with the
 /// original variable and ensure that this variable is updated/read with the
 /// most recent value.
 /// This corresponds to BoxFieldElement; we reuse BoxLocal from the original
 /// algorithm to correspond to the actual name of the variable.
 class JBoxedField extends JField {
   final BoxLocal box;
   JBoxedField(String name, int memberIndex, this.box,
@@ skipping 39 matching lines @@
   KernelScopeInfo scopeInfo;
 
   /// Collected [CapturedScope] data for nodes.
   Map<ir.Node, KernelCapturedScope> capturedScopesMap =
       <ir.Node, KernelCapturedScope>{};
 
   /// Collected [ScopeInfo] data for nodes.
   Map<ir.FunctionNode, KernelScopeInfo> closuresToGenerate =
       <ir.FunctionNode, KernelScopeInfo>{};
 }