Store constant variable initializers in elements.

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 121 matching lines @@
         coverageId: '${element.hashCode}',
         type: '${element.type}',
         inferredType: '$inferredType',
         size: size,
         code: code,
         outputUnit: _unitInfoForElement(element),
         isConst: element.isConst);
     _elementToInfo[element] = info;
     if (element.isConst) {
       var value = compiler.backend.constantCompilerTask
-          .getConstantValueForVariable(element);
+          .getConstantValue(element.constant);
       if (value != null) {
         info.initializer = _constantToInfo[value];
       }
     }
 
     List<FunctionInfo> nestedClosures = <FunctionInfo>[];
     for (Element closure in element.nestedClosures) {
       Info child = this.process(closure);
       if (child != null) {
         ClassInfo parent = this.process(closure.enclosingElement);
@@ skipping 434 matching lines @@
 
     ChunkedConversionSink<Object> sink = encoder.startChunkedConversion(
         new StringConversionSink.fromStringSink(buffer));
     sink.add(new AllInfoJsonCodec().encode(result));
     reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
       'text': "View the dumped .info.json file at "
           "https://dart-lang.github.io/dump-info-visualizer"
     });
   }
 }