Use better hash computer.

pkg/analyzer/lib/src/generated/constant.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.constant;
 
 import 'dart:collection';
 
 import 'ast.dart';
 import 'element.dart';
 import 'engine.dart' show AnalysisEngine, RecordingErrorListener;
 import 'error.dart';
 import 'java_core.dart';
-import 'java_engine.dart' show ObjectUtilities;
 import 'resolver.dart' show TypeProvider;
 import 'scanner.dart' show Token, TokenType;
 import 'source.dart' show Source;
 import 'utilities_collection.dart';
 import 'utilities_dart.dart' show ParameterKind;
+import 'package:analyzer/src/generated/utilities_general.dart';
 
 /**
  * Instances of the class `BoolState` represent the state of an object representing a boolean
  * value.
  */
 class BoolState extends InstanceState {
   /**
    * An instance representing the boolean value 'false'.
    */
   static BoolState FALSE_STATE = new BoolState(false);
@@ skipping 2170 matching lines @@
     }
     return null;
   }
 
   HashMap<String, DartObjectImpl> get fields => _state.fields;
 
   @override
   bool get hasExactValue => _state.hasExactValue;
 
   @override
-  int get hashCode =>
-      ObjectUtilities.combineHashCodes(type.hashCode, _state.hashCode);
+  int get hashCode => JenkinsSmiHash.hash2(type.hashCode, _state.hashCode);
 
   @override
   int get intValue {
     if (_state is IntState) {
       return (_state as IntState).value;
     }
     return null;
   }
 
   /**
@@ skipping 2962 matching lines @@
       return BoolState.from(_element == rightElement);
     } else if (rightOperand is DynamicState) {
       return BoolState.UNKNOWN_VALUE;
     }
     return BoolState.FALSE_STATE;
   }
 
   @override
   String toString() => _element == null ? "-unknown-" : _element.name;
 }