Generate needed classes for constant maps in metadata.

sdk/lib/_internal/compiler/implementation/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 260 matching lines @@
   ItemCompilationContext createItemCompilationContext() {
     return new ItemCompilationContext();
   }
 
   bool classNeedsRti(ClassElement cls);
   bool methodNeedsRti(FunctionElement function);
 
   /// Called during codegen when [constant] has been used.
   void registerCompileTimeConstant(Constant constant, Registry registry) {}
 
-  /// Called during resolution when a metadata [constant] for [annotatedElement]
-  /// has been evaluated.
-  void registerMetadataConstant(Constant constant,
+  /// Called during resolution when a constant value for [metadata] on
+  /// [annotatedElement] has been evaluated.
+  void registerMetadataConstant(MetadataAnnotation metadata,
                                 Element annotatedElement,
                                 Registry registry) {}
 
   /// Called during resolution to notify to the backend that a class is
   /// being instantiated.
   void registerInstantiatedClass(ClassElement cls,
                                  Enqueuer enqueuer,
                                  Registry registry) {}
 
   /// Register an is check to the backend.
@@ skipping 1830 matching lines @@
   int warnings = 0;
   int hints = 0;
 }
 
 class GenericTask extends CompilerTask {
   final String name;
 
   GenericTask(this.name, Compiler compiler)
       : super(compiler);
 }