Fix early erasure of resolution data

pkg/analyzer/lib/src/generated/engine.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import 'dart:collection';
@@ skipping 8171 matching lines @@
    * Invalidate all of the resolution information associated with the
    * compilation unit. The flag [invalidateUris] should be `true` if the cached
    * results of converting URIs to source files should also be invalidated.
    */
   void invalidateAllResolutionInformation(bool invalidateUris) {
     if (getState(PARSED_UNIT) == CacheState.FLUSHED) {
       ResolutionState state = _resolutionState;
       while (state != null) {
         if (state.getState(BUILT_UNIT) == CacheState.VALID) {
           CompilationUnit unit = state.getValue(BUILT_UNIT);
-          ResolutionEraser.erase(unit);
-          setValue(PARSED_UNIT, unit);
+          setValue(PARSED_UNIT, unit.accept(new AstCloner()));
           break;
         } else if (state.getState(RESOLVED_UNIT) == CacheState.VALID) {
           CompilationUnit unit = state.getValue(RESOLVED_UNIT);
-          ResolutionEraser.erase(unit);
-          setValue(PARSED_UNIT, unit);
+          setValue(PARSED_UNIT, unit.accept(new AstCloner()));
           break;
         }
         state = state._nextState;
       }
     }
     _discardCachedResolutionInformation(invalidateUris);
   }
 
   /**
    * Return `true` if this data is safe to use in refactoring.
@@ skipping 5352 matching lines @@
     _index++;
     if (_index >= _manager._workQueues[_queueIndex].length) {
       _index = 0;
       _queueIndex++;
       while (_queueIndex < _manager._workQueues.length && _manager._workQueues[_queueIndex].isEmpty) {
         _queueIndex++;
       }
     }
   }
 }