No longer store the compilation-context in WorkItem.

pkg/compiler/lib/src/ssa/interceptor_simplifier.dart

 // Copyright (c) 2013, 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 '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../elements/elements.dart';
 import '../js_backend/backend_helpers.dart' show BackendHelpers;
@@ skipping 22 matching lines @@
  *
  * 5) Some HIs operations on an interceptor are replaced with a HIs version that
  * uses 'instanceof' rather than testing a type flag.
  *
  */
 class SsaSimplifyInterceptors extends HBaseVisitor
     implements OptimizationPhase {
   final String name = "SsaSimplifyInterceptors";
   final ConstantSystem constantSystem;
   final Compiler compiler;
-  final CodegenWorkItem work;
+  final Element element;
   HGraph graph;
 
-  SsaSimplifyInterceptors(this.compiler, this.constantSystem, this.work);
+  SsaSimplifyInterceptors(this.compiler, this.constantSystem, this.element);
 
   JavaScriptBackend get backend => compiler.backend;
 
   BackendHelpers get helpers => backend.helpers;
 
   ClassWorld get classWorld => compiler.world;
 
   void visitGraph(HGraph graph) {
     this.graph = graph;
     visitDominatorTree(graph);
@@ skipping 65 matching lines @@
       return graph.thisInstruction;
     }
 
     ClassElement constantInterceptor = tryComputeConstantInterceptorFromType(
         input.instructionType, interceptedClasses);
 
     if (constantInterceptor == null) return null;
 
     // If we just happen to be in an instance method of the constant
     // interceptor, `this` is a shorter alias.
-    if (constantInterceptor == work.element.enclosingClass &&
+    if (constantInterceptor == element.enclosingClass &&
         graph.thisInstruction != null) {
       return graph.thisInstruction;
     }
 
     ConstantValue constant =
         new InterceptorConstantValue(constantInterceptor.thisType);
     return graph.addConstant(constant, compiler);
   }
 
   ClassElement tryComputeConstantInterceptorFromType(
@@ skipping 272 matching lines @@
       instruction = new HInvokeDynamicMethod(
           selector, mask, inputs, node.instructionType, true);
     }
 
     HBasicBlock block = node.block;
     block.addAfter(node, instruction);
     block.rewrite(node, instruction);
     return true;
   }
 }