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

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

Index: pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart
diff --git a/pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart b/pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart
index 372536f30ea80e8af5464774c8d9da1b1ca7b729..deadcb73e45f98b3adc99294156ef817ae67a765 100644
--- a/pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart
+++ b/pkg/compiler/lib/src/js_emitter/program_builder/program_builder.dart
@@ -99,9 +99,9 @@ class ProgramBuilder {
     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.