Revert "Remove Registry from registerMetadataConstant" and "Serialize metadata"

pkg/compiler/lib/src/resolution/resolution.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.
 
 library dart2js.resolution;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 1070 matching lines @@
                   constant = new ErroneousConstantExpression();
                   break;
               }
               annotation.constant = constant;
 
               constantCompiler.evaluate(annotation.constant);
               // TODO(johnniwinther): Register the relation between the annotation
               // and the annotated element instead. This will allow the backend to
               // retrieve the backend constant and only register metadata on the
               // elements for which it is needed. (Issue 17732).
+              registry.registerMetadataConstant(annotation);
               annotation.resolutionState = STATE_DONE;
             }));
   }
 
   List<MetadataAnnotation> resolveMetadata(
       Element element, VariableDefinitions node) {
     List<MetadataAnnotation> metadata = <MetadataAnnotation>[];
     for (Metadata annotation in node.metadata.nodes) {
       ParameterMetadataAnnotation metadataAnnotation =
           new ParameterMetadataAnnotation(annotation);
@@ skipping 19 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements != null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }