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

pkg/compiler/lib/src/dump_info.dart

 // Copyright (c) 2013, 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 dump_info;
 
 import 'dart:convert'
     show ChunkedConversionSink, JsonEncoder, StringConversionSink;
 
 import 'package:dart2js_info/info.dart';
@@ skipping 397 matching lines @@
       <ConstantValue, jsAst.Node>{};
   // A mapping from Javascript AST Nodes to the size of their
   // pretty-printed contents.
   final Map<jsAst.Node, int> _nodeToSize = <jsAst.Node, int>{};
 
   final Map<Element, int> inlineCount = <Element, int>{};
   // A mapping from an element to a list of elements that are
   // inlined inside of it.
   final Map<Element, List<Element>> inlineMap = <Element, List<Element>>{};
 
-  final Map<Element, WorldImpact> impacts = <Element, WorldImpact>{};
+  final Map<MemberEntity, WorldImpact> impacts = <MemberEntity, WorldImpact>{};
 
   /// Register the size of the generated output.
   void reportSize(int programSize) {
     _programSize = programSize;
   }
 
   void reportInlined(Element element, Element inlinedFrom) {
     element = element.declaration;
     inlinedFrom = inlinedFrom.declaration;
 
     inlineCount.putIfAbsent(element, () => 0);
     inlineCount[element] += 1;
     inlineMap.putIfAbsent(inlinedFrom, () => new List<Element>());
     inlineMap[inlinedFrom].add(element);
   }
 
-  void registerImpact(Element element, WorldImpact impact) {
+  void registerImpact(MemberEntity element, WorldImpact impact) {
     if (compiler.options.dumpInfo) {
       impacts[element] = impact;
     }
   }
 
   void unregisterImpact(var impactSource) {
     impacts.remove(impactSource);
   }
 
   /**
@@ skipping 166 matching lines @@
 
     ChunkedConversionSink<Object> sink = encoder.startChunkedConversion(
         new StringConversionSink.fromStringSink(buffer));
     sink.add(new AllInfoJsonCodec().encode(result));
     compiler.reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
       'text': "View the dumped .info.json file at "
           "https://dart-lang.github.io/dump-info-visualizer"
     });
   }
 }