Remove ConstantExpression.value

pkg/compiler/lib/src/patch_parser.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This library contains the infrastructure to parse and integrate patch files.
  *
  * Three types of elements can be patched: [LibraryElement], [ClassElement],
  * [FunctionElement]. Patches are introduced in patch libraries which are loaded
  * together with the corresponding origin library. Which libraries that are
@@ skipping 344 matching lines @@
   /// Checks that the annotation value is valid.
   void validate(Compiler compiler,
                 Element element,
                 MetadataAnnotation annotation,
                 ConstantValue constant);
 
 
   /// Checks [element] for metadata matching the [handler]. Return a non-null
   /// annotation marker matching metadata was found.
   static checkAnnotation(Compiler compiler,
-                              Element element,
-                              EagerAnnotationHandler handler) {
+                         Element element,
+                         EagerAnnotationHandler handler) {
     for (Link<MetadataAnnotation> link = element.metadata;
          !link.isEmpty;
          link = link.tail) {
       MetadataAnnotation annotation = link.head;
       var result = handler.apply(compiler, element, annotation);
       if (result != null) {
         // TODO(johnniwinther): Perform this check in
         // [Compiler.onLibrariesLoaded].
         compiler.enqueuer.resolution.addDeferredAction(element, () {
           annotation.ensureResolved(compiler);
           handler.validate(
-              compiler, element, annotation, annotation.constant.value);
+              compiler, element, annotation,
+              compiler.constants.getConstantValue(annotation.constant));
         });
         return result;
       }
     }
     return null;
   }
 }
 
 /// Annotation handler for pre-resolution detection of `@Native(...)`
 /// annotations.
@@ skipping 175 matching lines @@
 
 class PatchVersion {
   final String tag;
 
   const PatchVersion(this.tag);
 
   bool isActive(String patchTag) => tag == null || tag == patchTag;
 
   String toString() => 'PatchVersion($tag)';
 }