No longer store the compilation-context in WorkItem.

pkg/compiler/lib/src/ssa/nodes.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 '../closure.dart';
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../dart_types.dart';
@@ skipping 146 matching lines @@
   Element element; // Used for debug printing.
   HBasicBlock entry;
   HBasicBlock exit;
   HThis thisInstruction;
 
   /// Receiver parameter, set for methods using interceptor calling convention.
   HParameterValue explicitReceiverParameter;
   bool isRecursiveMethod = false;
   bool calledInLoop = false;
   final List<HBasicBlock> blocks = <HBasicBlock>[];
+
+  /// Nodes containing list allocations for which there is a known fixed length.
+  // TODO(sigmund,sra): consider not storing this explicitly here (e.g. maybe
+  // store it on HInstruction, or maybe this can be computed on demand).
+  final Set<HInstruction> allocatedFixedLists = new Set<HInstruction>();
+
   SourceInformation sourceInformation;
 
   // We canonicalize all constants used within a graph so we do not
   // have to worry about them for global value numbering.
   Map<ConstantValue, HConstant> constants = new Map<ConstantValue, HConstant>();
 
   HGraph() {
     entry = addNewBlock();
     // The exit block will be added later, so it has an id that is
     // after all others in the system.
@@ skipping 3246 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }