Move dart_types to elements/resolution_types

pkg/compiler/lib/src/kernel/kernel_visitor.dart

 // Copyright (c) 2016, 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.md file.
 
 import 'package:kernel/ast.dart' as ir;
 import 'package:kernel/frontend/accessors.dart'
     show
         Accessor,
         IndexAccessor,
         NullAwarePropertyAccessor,
@@ skipping 13 matching lines @@
 import '../common.dart';
 import '../common/names.dart';
 import '../constants/expressions.dart'
     show
         BoolFromEnvironmentConstantExpression,
         ConstantExpression,
         ConstructedConstantExpression,
         IntFromEnvironmentConstantExpression,
         StringFromEnvironmentConstantExpression,
         TypeConstantExpression;
-import '../dart_types.dart' show DartType, InterfaceType;
+import '../elements/resolution_types.dart' show DartType, InterfaceType;
 import '../diagnostics/spannable.dart' show Spannable;
 import '../elements/elements.dart'
     show
         AstElement,
         AsyncMarker,
         ClassElement,
         ConstructorElement,
         Element,
         FieldElement,
         FunctionElement,
@@ skipping 2802 matching lines @@
       : this(null, true, node, initializers);
 
   accept(ir.Visitor v) => throw "unsupported";
 
   visitChildren(ir.Visitor v) => throw "unsupported";
 
   String toString() {
     return "IrFunction($kind, $isConstructor, $node, $initializers)";
   }
 }