Add toStructuredText to ConstantExpression and align method names with ConstantValue

pkg/compiler/lib/src/resolution/registry.dart

 // Copyright (c) 2014, 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 dart2js.resolution.registry;
 
 import '../common.dart';
 import '../common/backend_api.dart' show Backend, ForeignResolver;
 import '../common/resolution.dart'
     show Feature, ListLiteralUse, MapLiteralUse, ResolutionImpact;
@@ skipping 111 matching lines @@
     }
     if (_listLiterals != null) {
       sb.write('\n list-literals:');
       for (ListLiteralUse use in _listLiterals) {
         sb.write('\n  $use');
       }
     }
     if (_constantLiterals != null) {
       sb.write('\n const-literals:');
       for (ConstantExpression constant in _constantLiterals) {
-        sb.write('\n  ${constant.getText()}');
+        sb.write('\n  ${constant.toDartText()}');
       }
     }
     if (_constSymbolNames != null) {
       sb.write('\n const-symbol-names: $_constSymbolNames');
     }
     return sb.toString();
   }
 }
 
 /// [ResolutionRegistry] collects all resolution information. It stores node
@@ skipping 282 matching lines @@
   @override
   void registerInstantiatedType(InterfaceType type) {
     registry.registerInstantiation(type);
   }
 
   @override
   DartType resolveTypeFromString(Node node, String typeName) {
     return visitor.resolveTypeFromString(node, typeName);
   }
 }