Use better hash computer.

pkg/analyzer/lib/src/generated/java_engine.dart

 library java.engine;
 
 import 'interner.dart';
 import 'java_core.dart';
 
 /**
  * A predicate is a one-argument function that returns a boolean value.
  */
 typedef bool Predicate<E>(E argument);
 
@@ skipping 97 matching lines @@
       return "";
     }
     int index = fileName.lastIndexOf('.');
     if (index >= 0) {
       return fileName.substring(index + 1);
     }
     return "";
   }
 }
 
-class ObjectUtilities {
-  static int combineHashCodes(int first, int second) => first * 31 + second;
-}
-
 
 class StringUtilities {
   static const String EMPTY = '';
   static const List<String> EMPTY_ARRAY = const <String>[];
 
   static Interner INTERNER = new NullInterner();
 
   static endsWith3(String str, int c1, int c2, int c3) {
     var length = str.length;
     return length >= 3 &&
@@ skipping 196 matching lines @@
 }
 
 
 class UUID {
   static int __nextId = 0;
   final String id;
   UUID(this.id);
   String toString() => id;
   static UUID randomUUID() => new UUID((__nextId).toString());
 }