dart2js: Rename "current isolate" to "static state (holder)".

pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart

 // Copyright (c) 2014, 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.
 
 library dart2js.js_emitter.program_builder;
 
 import '../js_emitter.dart' show computeMixinClass, Emitter;
 import '../model.dart';
 
 import '../../common.dart';
@@ skipping 81 matching lines @@
     // happens when the deferred code is dead-code eliminated but we still need
     // to check that the library has been loaded.
     _compiler.deferredLoadTask.allOutputUnits.forEach(
         _registry.registerOutputUnit);
     collector.outputClassLists.forEach(_registry.registerElements);
     collector.outputStaticLists.forEach(_registry.registerElements);
     collector.outputConstantLists.forEach(_registerConstants);
     collector.outputStaticNonFinalFieldLists.forEach(
         _registry.registerElements);
 
-    // TODO(kasperl): There's code that implicitly needs access to the special
-    // $ holder so we have to register that. Can we track if we have to?
-    _registry.registerHolder(r'$');
+    // We always add the current isolate holder.
+    _registry.registerHolder(
+        namer.staticStateHolder, isStaticStateHolder: true);
 
     // We need to run the native-preparation before we build the output. The
     // preparation code, in turn needs the classes to be set up.
     // We thus build the classes before building their containers.
     collector.outputClassLists.forEach((OutputUnit _, List<ClassElement> classes) {
       classes.forEach(_buildClass);
     });
 
     // Resolve the superclass references after we've processed all the classes.
     _classes.forEach((ClassElement element, Class c) {
@@ skipping 675 matching lines @@
       _registry.registerConstant(outputUnit, constantValue);
       assert(!_constants.containsKey(constantValue));
       js.Name name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 }