Move parser and token related libraries into their own subfolder.

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/names.dart' show
     Identifiers;
@@ skipping 21 matching lines @@
     FieldElementX,
     FunctionElementX,
     GetterElementX,
     MetadataAnnotationX,
     MixinApplicationElementX,
     ParameterMetadataAnnotation,
     SetterElementX,
     TypedefElementX;
 import '../enqueue.dart' show
     WorldImpact;
-import '../scanner/token.dart' show
+import '../tokens/token.dart' show
     isBinaryOperator,
     isMinusOperator,
     isTernaryOperator,
     isUnaryOperator,
     isUserDefinableOperator;
 import '../tree/tree.dart';
 import '../util/util.dart' show
     Link,
     LinkBuilder,
     Setlet;
@@ skipping 985 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements !=null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }