Share more logic between the Ssa(Ast)Builder and SsaKernelBuilder

pkg/compiler/lib/src/js_emitter/program_builder/collector.dart

 // Copyright (c) 2015, 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.
 
 part of dart2js.js_emitter.program_builder;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
  * The code for the containing (used) methods must exist in the `universe`.
  */
 class Collector {
   final CompilerOptions _options;
   final CommonElements _commonElements;
   final DeferredLoadTask _deferredLoadTask;
   final CodegenWorldBuilder _worldBuilder;
   // TODO(floitsch): the code-emitter task should not need a namer.
   final Namer _namer;
   final Emitter _emitter;
   final JavaScriptConstantCompiler _constantHandler;
   final NativeData _nativeData;
   final InterceptorData _interceptorData;
   final OneShotInterceptorData _oneShotInterceptorData;
   final MirrorsData _mirrorsData;
   final ClosedWorld _closedWorld;
   final Set<ClassEntity> _rtiNeededClasses;
-  final Map<MemberElement, js.Expression> _generatedCode;
+  final Map<MemberEntity, js.Expression> _generatedCode;
   final Sorter _sorter;
 
   final Set<ClassEntity> neededClasses = new Set<ClassEntity>();
   // This field is set in [computeNeededDeclarations].
   Set<ClassEntity> classesOnlyNeededForRti;
   final Map<OutputUnit, List<ClassEntity>> outputClassLists =
       new Map<OutputUnit, List<ClassEntity>>();
   final Map<OutputUnit, List<ConstantValue>> outputConstantLists =
       new Map<OutputUnit, List<ConstantValue>>();
   final Map<OutputUnit, List<MemberEntity>> outputStaticLists =
@@ skipping 316 matching lines @@
   }
 
   void collect() {
     computeNeededDeclarations();
     computeNeededConstants();
     computeNeededStatics();
     computeNeededStaticNonFinalFields();
     computeNeededLibraries();
   }
 }