Generate needed classes for constant maps in metadata.

sdk/lib/_internal/compiler/implementation/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.
 
 part of resolution;
 
 /// [ResolutionRegistry] collects all resolution information. It stores node
 /// related information in a [TreeElements] mapping and registers calls with
 /// [Backend], [World] and [Enqueuer].
 // TODO(johnniwinther): Split this into an interface and implementation class.
@@ skipping 187 matching lines @@
   }
 
   void registerInstantiatedClass(ClassElement element) {
     world.registerInstantiatedClass(element, this);
   }
 
   void registerLazyField() {
     backend.resolutionCallbacks.onLazyField(this);
   }
 
-  void registerMetadataConstant(Constant constant, Element annotatedElement) {
-    backend.registerMetadataConstant(constant, annotatedElement, this);
+  void registerMetadataConstant(MetadataAnnotation metadata,
+                                Element annotatedElement) {
+    backend.registerMetadataConstant(metadata, annotatedElement, this);
   }
 
   void registerThrowRuntimeError() {
     backend.resolutionCallbacks.onThrowRuntimeError(this);
   }
 
   void registerTypeVariableBoundCheck() {
     backend.resolutionCallbacks.onTypeVariableBoundCheck(this);
   }
 
@@ skipping 138 matching lines @@
 
   void registerAssert(Send node) {
     mapping.setAssert(node);
     backend.resolutionCallbacks.onAssert(node, this);
   }
 
   bool isAssert(Send node) {
     return mapping.isAssert(node);
   }
 }