Remove ConstantExpression.value

pkg/compiler/lib/src/resolution/resolution_common.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 resolution;
 
 class ResolverTask extends CompilerTask {
   final ConstantCompiler constantCompiler;
 
   ResolverTask(Compiler compiler, this.constantCompiler) : super(compiler);
@@ skipping 515 matching lines @@
       element.supertypeLoadState = STATE_DONE;
       element.resolutionState = STATE_DONE;
       // TODO(johnniwinther): Check matching type variables and
       // empty extends/implements clauses.
     }
   }
 
   void _postProcessClassElement(BaseClassElementX element) {
     for (MetadataAnnotation metadata in element.metadata) {
       metadata.ensureResolved(compiler);
-      if (!element.isProxy &&
-          metadata.constant.value == compiler.proxyConstant) {
+      ConstantValue value =
+          compiler.constants.getConstantValue(metadata.constant);
+      if (!element.isProxy && value == compiler.proxyConstant) {
         element.isProxy = true;
       }
     }
 
     // Force resolution of metadata on non-instance members since they may be
     // inspected by the backend while emitting. Metadata on instance members is
     // handled as a result of processing instantiated class members in the
     // enqueuer.
     // TODO(ahe): Avoid this eager resolution.
     element.forEachMember((_, Element member) {
@@ skipping 493 matching lines @@
 
   void reportDuplicateDefinition(String name,
                                  Spannable definition,
                                  Spannable existing) {
     compiler.reportError(definition,
         MessageKind.DUPLICATE_DEFINITION, {'name': name});
     compiler.reportInfo(existing,
         MessageKind.EXISTING_DEFINITION, {'name': name});
   }
 }