Split KernelToElementMap into sub-interfaces

pkg/compiler/lib/src/ssa/kernel_impact.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 file.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart';
 import '../compiler.dart';
 import '../constants/expressions.dart';
@@ skipping 45 matching lines @@
     if (member == null) {
       throw "FOUND NULL FIELD: $element";
     }
   } else {
     throw new UnsupportedError("Unsupported element: $element");
   }
   return member;
 }
 
 ResolutionImpact buildKernelImpact(
-    ir.Member member, KernelToElementMap elementAdapter) {
+    ir.Member member, KernelToElementMapForImpact elementAdapter) {
   KernelImpactBuilder builder = new KernelImpactBuilder(elementAdapter, member);
   if (member is ir.Procedure) {
     return builder.buildProcedure(member);
   } else if (member is ir.Constructor) {
     return builder.buildConstructor(member);
   } else if (member is ir.Field) {
     return builder.buildField(member);
   }
   throw new UnsupportedError("Unsupported member: $member");
 }
 
 class KernelImpactBuilder extends ir.Visitor {
   final ResolutionWorldImpactBuilder impactBuilder;
-  final KernelToElementMap elementAdapter;
+  final KernelToElementMapForImpact elementAdapter;
   final ir.Member currentMember;
 
   KernelImpactBuilder(this.elementAdapter, this.currentMember)
       : this.impactBuilder =
             new ResolutionWorldImpactBuilder('${currentMember.name}');
 
   CommonElements get commonElements => elementAdapter.commonElements;
 
   /// Add a checked-mode type use of [type] if it is not `dynamic`.
   DartType checkType(ir.DartType irType) {
@@ skipping 521 matching lines @@
     ConstructorEntity target = elementAdapter.getConstructor(node.target);
     impactBuilder.registerStaticUse(new StaticUse.superConstructorInvoke(
         target, elementAdapter.getCallStructure(node.arguments)));
   }
 
   // TODO(johnniwinther): Make this throw and visit child nodes explicitly
   // instead to ensure that we don't visit unwanted parts of the ir.
   @override
   void defaultNode(ir.Node node) => node.visitChildren(this);
 }