Fix static warning - I forgot to remove a field after all the refactorings.

pkg/compiler/lib/src/ssa/optimize.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.
 
 import '../common/codegen.dart' show CodegenWorkItem;
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../core_types.dart' show CoreClasses;
@@ skipping 139 matching lines @@
   // a single use.  This protects against exponentially large constant folded
   // strings.
   static const MAX_SHARED_CONSTANT_FOLDED_STRING_LENGTH = 512;
 
   final String name = "SsaInstructionSimplifier";
   final JavaScriptBackend backend;
   final ConstantSystem constantSystem;
   HGraph graph;
   Compiler get compiler => backend.compiler;
   final SsaOptimizerTask optimizer;
-  final Set<HInstruction> allocatedFixedLists;
 
   SsaInstructionSimplifier(this.constantSystem, this.backend, this.optimizer);
 
   CoreClasses get coreClasses => compiler.coreClasses;
 
   BackendHelpers get helpers => backend.helpers;
 
   void visitGraph(HGraph visitee) {
     graph = visitee;
     visitDominatorTree(visitee);
@@ skipping 2410 matching lines @@
 
     keyedValues.forEach((receiver, values) {
       result.keyedValues[receiver] =
           new Map<HInstruction, HInstruction>.from(values);
     });
 
     result.nonEscapingReceivers.addAll(nonEscapingReceivers);
     return result;
   }
 }