Implement is-checks against type variables.

sdk/lib/_internal/compiler/implementation/compiler.dart

Index: sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/compiler.dart b/sdk/lib/_internal/compiler/implementation/compiler.dart
index aae34dfb784948e09930fbd6d99044425a85f620..5b594d72cc9eb89c6cd468129cf010d38b2ae86f 100644
--- a/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -104,6 +104,9 @@ abstract class Backend {
     });
   }
 
+  // TODO(karlklose): get rid of this and specify the dependencies in the patch.

[ngeoffray, 2013/02/27 16:18:37]

What's the patch? Please expand the comment and explain what you would need to
do.

[karlklose, 2013/02/28 11:37:46]

Done.

+  void addBackendRtiDependencies(World world);
+
   void enqueueHelpers(ResolutionEnqueuer world);
   void codegen(CodegenWorkItem work);