Implement .getCallType

pkg/compiler/lib/src/kernel/env.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.env;
 
 import 'package:kernel/ast.dart' as ir;
 import 'package:kernel/clone.dart';
 import 'package:kernel/type_algebra.dart';
 
@@ skipping 409 matching lines @@
   @override
   ir.Class get cls => null;
 }
 
 class ClassData {
   /// TODO(johnniwinther): Remove this from the [ClassData] interface. Use
   /// `definition.node` instead.
   final ir.Class cls;
   final ClassDefinition definition;
   bool isMixinApplication;
+  bool isCallTypeComputed = false;
 
   InterfaceType thisType;
   InterfaceType rawType;
   InterfaceType supertype;
   InterfaceType mixedInType;
   List<InterfaceType> interfaces;
   OrderedTypeSet orderedTypeSet;
+  DartType callType;
 
   Iterable<ConstantValue> _metadata;
 
   ClassData(this.cls, this.definition);
 
   Iterable<ConstantValue> getMetadata(KernelToElementMapBase elementMap) {
     return _metadata ??= elementMap.getMetadata(cls.annotations);
   }
 
   ClassData copy() {
@@ skipping 147 matching lines @@
   }
 }
 
 class TypedefData {
   final ir.Typedef node;
   final TypedefEntity element;
   final TypedefType rawType;
 
   TypedefData(this.node, this.element, this.rawType);
 }