Remove static state.

pkg/compiler/lib/src/world.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.
 
 part of dart2js;
 
 abstract class ClassWorld {
   // TODO(johnniwinther): Refine this into a `BackendClasses` interface.
   Backend get backend;
 
@@ skipping 93 matching lines @@
 
 class World implements ClassWorld {
   ClassElement get objectClass => compiler.objectClass;
   ClassElement get functionClass => compiler.functionClass;
   ClassElement get boolClass => compiler.boolClass;
   ClassElement get numClass => compiler.numClass;
   ClassElement get intClass => compiler.intClass;
   ClassElement get doubleClass => compiler.doubleClass;
   ClassElement get stringClass => compiler.stringClass;
 
+  Map<Selector, Map<ti.TypeMask, TypedSelector>> canonicalizedValues =
+     new Map<Selector, Map<ti.TypeMask, TypedSelector>>();
+
   bool checkInvariants(ClassElement cls, {bool mustBeInstantiated: true}) {
     return
       invariant(cls, cls.isDeclaration,
                 message: '$cls must be the declaration.') &&
       invariant(cls, cls.isResolved,
                 message: '$cls must be resolved.') &&
       (!mustBeInstantiated ||
        invariant(cls, isInstantiated(cls),
                  message: '$cls is not instantiated.'));
  }
@@ skipping 397 matching lines @@
     // function expressions's element.
     // TODO(herhut): Generate classes for function expressions earlier.
     if (element is closureMapping.SynthesizedCallMethodElementX) {
       return getMightBePassedToApply(element.expression);
     }
     return functionsThatMightBePassedToApply.contains(element);
   }
 
   bool get hasClosedWorldAssumption => !compiler.hasIncrementalSupport;
 }