Use entities in most of MirrorsData

pkg/compiler/lib/src/js_emitter/program_builder/collector.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 dart2js.js_emitter.program_builder;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 120 matching lines @@
    * Compute all the constants that must be emitted.
    */
   void computeNeededConstants() {
     // Make sure we retain all metadata of all elements. This could add new
     // constants to the handler.
     if (_mirrorsData.mustRetainMetadata) {
       // TODO(floitsch): verify that we don't run through the same elements
       // multiple times.
       for (MemberElement element in _generatedCode.keys) {
         if (_mirrorsData.isMemberAccessibleByReflection(element)) {
-          bool shouldRetainMetadata =
-              _mirrorsData.retainMetadataOfMember(element);
-          if (shouldRetainMetadata &&
-              (element.isFunction ||
-                  element.isConstructor ||
-                  element.isSetter)) {
-            MethodElement function = element;
-            function.functionSignature.forEachParameter((parameter) =>
-                _mirrorsData.retainMetadataOfParameter(parameter));
-          }
+          _mirrorsData.retainMetadataOfMember(element);
         }
       }
       for (ClassElement cls in neededClasses) {
         final onlyForRti = classesOnlyNeededForRti.contains(cls);
         if (!onlyForRti) {
           _mirrorsData.retainMetadataOfClass(cls);
           new FieldVisitor(_options, _elementEnvironment, _worldBuilder,
                   _nativeData, _mirrorsData, _namer, _closedWorld)
               .visitFields((FieldEntity member,
                   js.Name name,
@@ skipping 191 matching lines @@
   }
 
   void collect() {
     computeNeededDeclarations();
     computeNeededConstants();
     computeNeededStatics();
     computeNeededStaticNonFinalFields();
     computeNeededLibraries();
   }
 }