Support jsinterop/world_test from .dill

pkg/compiler/lib/src/kernel/element_map_mixins.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:js_runtime/shared/embedded_names.dart';
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart';
 import '../constants/constructors.dart';
@@ skipping 384 matching lines @@
         isJsInterop: isJsInterop);
   }
 
   /// Computes the native behavior for writing to the native [field].
   // TODO(johnniwinther): Cache this for later use.
   native.NativeBehavior getNativeBehaviorForFieldStore(ir.Field field) {
     DartType type = getDartType(field.type);
     return nativeBehaviorBuilder.buildFieldStoreBehavior(type);
   }
 
-  /// Computes the native behavior for calling [procedure].
+  /// Computes the native behavior for calling [member].
   // TODO(johnniwinther): Cache this for later use.
-  native.NativeBehavior getNativeBehaviorForMethod(ir.Procedure procedure,
+  native.NativeBehavior getNativeBehaviorForMethod(ir.Member member,
       {bool isJsInterop}) {
-    DartType type = getFunctionType(procedure.function);
-    List<ConstantValue> metadata = getMetadata(procedure.annotations);
+    DartType type;
+    if (member is ir.Procedure) {
+      type = getFunctionType(member.function);
+    } else if (member is ir.Constructor) {
+      type = getFunctionType(member.function);
+    } else {
+      failedAt(CURRENT_ELEMENT_SPANNABLE, "Unexpected method node $member.");
+    }
+    List<ConstantValue> metadata = getMetadata(member.annotations);
     return nativeBehaviorBuilder.buildMethodBehavior(
         type, metadata, typeLookup(resolveAsRaw: false),
         isJsInterop: isJsInterop);
   }
 }
 
 abstract class KernelToElementMapForBuildingMixin
     implements KernelToElementMapForBuilding, KernelToElementMapBaseMixin {
   js.Template getJsBuiltinTemplate(
       ConstantValue constant, CodeEmitterTask emitter) {
@@ skipping 422 matching lines @@
     }
     if (isRedirecting) {
       return new RedirectingGenerativeConstantConstructor(
           defaultValues, superConstructorInvocation);
     } else {
       return new GenerativeConstantConstructor(
           type, defaultValues, fieldMap, superConstructorInvocation);
     }
   }
 }