Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

pkg/compiler/lib/src/mirror_renamer/renamer.dart

 // Copyright (c) 2013, 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 mirror_renamer;
 
 class MirrorRenamerImpl implements MirrorRenamer {
   static const String MIRROR_HELPER_GET_NAME_FUNCTION = 'helperGetName';
   static final Uri DART_MIRROR_HELPER =
       new Uri(scheme: 'dart', path: '_mirror_helper');
@@ skipping 98 matching lines @@
     sb.writeCharCode(0); // Terminate the string with '0', see [StringScanner].
     topLevelNodes.add(parse(sb.toString()));
 
     // Replace calls to Mirrorsystem.getName with calls to helper function.
     mirrorSystemGetNameNodes.forEach((node) {
       renames[node.selector] = renames[getNameFunctionNode.name];
       renames[node.receiver] = '';
     });
   }
 }