Split KernelToElementMap into sub-interfaces

tests/compiler/dart2js/closure/closure_test.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 'dart:io';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/closure.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
@@ skipping 32 matching lines @@
       .run();
 }
 
 /// Compute closure data mapping for [member] as a kernel based element.
 ///
 /// Fills [actualMap] with the data and [sourceSpanMap] with the source spans
 /// for the data origin.
 void computeKernelClosureData(Compiler compiler, MemberEntity member,
     Map<Id, String> actualMap, Map<Id, SourceSpan> sourceSpanMap) {
   KernelBackendStrategy backendStrategy = compiler.backendStrategy;
-  KernelToElementMap elementMap = backendStrategy.elementMap;
+  KernelToElementMapForBuilding elementMap = backendStrategy.elementMap;
   GlobalLocalsMap localsMap = backendStrategy.globalLocalsMapForTesting;
   ClosureDataLookup closureDataLookup = backendStrategy.closureDataLookup;
   new ClosureIrChecker(actualMap, sourceSpanMap, elementMap, member,
           localsMap.getLocalsMap(member), closureDataLookup)
       .run(elementMap.getMemberNode(member));
 }
 
 /// Ast visitor for computing closure data.
 class ClosureAstComputer extends AbstractResolvedAstComputer {
   final ClosureDataLookup<ast.Node> closureDataLookup;
@@ skipping 29 matching lines @@
 
 /// Kernel IR visitor for computing closure data.
 class ClosureIrChecker extends AbstractIrComputer {
   final ClosureDataLookup<ir.Node> closureDataLookup;
   final ClosureRepresentationInfo info;
   final KernelToLocalsMap _localsMap;
 
   ClosureIrChecker(
       Map<Id, String> actualMap,
       Map<Id, SourceSpan> sourceSpanMap,
-      KernelToElementMap elementMap,
+      KernelToElementMapForBuilding elementMap,
       MemberEntity member,
       this._localsMap,
       this.closureDataLookup)
       : this.info = closureDataLookup.getClosureRepresentationInfo(member),
         super(actualMap, sourceSpanMap);
 
   @override
   String computeNodeValue(ir.Node node) {
     if (node is ir.VariableDeclaration) {
       Local local = _localsMap.getLocal(node);
@@ skipping 13 matching lines @@
 
 /// Compute a string representation of the data stored for [local] in [info].
 String computeLocalValue(ClosureRepresentationInfo info, Local local) {
   StringBuffer sb = new StringBuffer();
   if (info.variableIsUsedInTryOrSync(local)) {
     sb.write('inTry');
   }
   // TODO(johnniwinther,efortuna): Add more info (captured, boxed etc.).
   return sb.toString();
 }