Add nonboxed closure class fields.

pkg/compiler/lib/src/kernel/element_map_impl.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.
 
 library dart2js.kernel.element_map;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 669 matching lines @@
       ..isMixinApplication = false
       ..thisType =
           closureData.rawType = new InterfaceType(cls, const/*<DartType>*/ [])
       ..supertype = supertype
       ..interfaces = const <InterfaceType>[];
     var setBuilder =
         new _KernelOrderedTypeSetBuilder((this as KernelToElementMapBase), cls);
     _classData.add(closureData);
     closureData.orderedTypeSet = setBuilder.createOrderedTypeSet(
         closureData.supertype, const Link<InterfaceType>());
+
+    cls.forEachCapturedVariable((Local local, JField field) {
+      field.setClosureMemberIndex = _memberData.length;
+      // TODO(efortuna): Uncomment this line after Johnni's added in his CL
+      // about Class/MemberDefinition.
+      //_memberData.add(field);
+    });
     // TODO(efortuna): Does getMetadata get called in ClassData for this object?
   }
 
   ClassEntity _getClass(ir.Class node, [ClassEnv classEnv]) {
     return _classMap.putIfAbsent(node, () {
       KLibrary library = _getLibrary(node.enclosingLibrary);
       if (classEnv == null) {
         classEnv = _libraryEnvs[library.libraryIndex].lookupClass(node.name);
       }
       _classEnvs.add(classEnv);
@@ skipping 1306 matching lines @@
       if (data.constructorBody != null) {
         f(data.constructorBody);
       }
     });
   }
 
   String getDeferredUri(ir.LibraryDependency node) {
     throw new UnimplementedError('JsKernelToElementMap.getDeferredUri');
   }
 }