dart2js cps: Use oneshot interceptors and 'instanceof' expressions.

pkg/compiler/lib/src/js_backend/codegen/glue.dart

Index: pkg/compiler/lib/src/js_backend/codegen/glue.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/glue.dart b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
index 463d6da9c9f82b7de25b228c188b95e40975e9e7..b7d4c2406ab5c2cde92e517fe1cf43a1ff2482e0 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/glue.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
@@ -292,4 +292,12 @@ class Glue {
   }
 
   FunctionElement get closureFromTearOff => _backend.helpers.closureFromTearOff;
+
+  js.Name registerOneShotInterceptor(Selector selector) {
+    return _backend.registerOneShotInterceptor(selector);
+  }
+
+  bool mayGenerateInstanceofCheck(DartType type) {
+    return _backend.mayGenerateInstanceofCheck(type);
+  }
 }