Move constant expression resynthesis into ConstVariableElement mixin.

pkg/analyzer/lib/src/summary/resynthesize.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.
 
 library summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 2154 matching lines @@
   UnitExplicitTopLevelVariables buildUnitExplicitTopLevelVariables() {
     List<UnlinkedVariable> unlinkedVariables = unlinkedUnit.variables;
     int numberOfVariables = unlinkedVariables.length;
     UnitExplicitTopLevelVariables variablesData =
         new UnitExplicitTopLevelVariables(numberOfVariables);
     for (int i = 0; i < numberOfVariables; i++) {
       UnlinkedVariable unlinkedVariable = unlinkedVariables[i];
       TopLevelVariableElementImpl element;
       if (unlinkedVariable.initializer?.bodyExpr != null &&
           unlinkedVariable.isConst) {
-        ConstTopLevelVariableElementImpl constElement =
-            new ConstTopLevelVariableElementImpl.forSerialized(
-                unlinkedVariable, unit);
-        element = constElement;
-        constElement.constantInitializer =
-            _buildConstExpression(null, unlinkedVariable.initializer.bodyExpr);
+        element = new ConstTopLevelVariableElementImpl.forSerialized(
+            unlinkedVariable, unit);
       } else {
         element = new TopLevelVariableElementImpl.forSerialized(
             unlinkedVariable, unit);
       }
       variablesData.variables[i] = element;
       // implicit accessors
       variablesData.implicitAccessors.add(buildImplicitGetter(element));
       if (!(element.isConst || element.isFinal)) {
         variablesData.implicitAccessors.add(buildImplicitSetter(element));
       }
@@ skipping 209 matching lines @@
   static String _getElementIdentifier(String name, ReferenceKind kind) {
     if (kind == ReferenceKind.topLevelPropertyAccessor ||
         kind == ReferenceKind.propertyAccessor) {
       if (!name.endsWith('=')) {
         return name + '?';
       }
     }
     return name;
   }
 }