dart2js cps: Extend type masks to handle reflective invocations.

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 b4419603db1f0373fa2c2f6ffbb9dfa126d5c34b..463d6da9c9f82b7de25b228c188b95e40975e9e7 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/glue.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
@@ -30,7 +30,7 @@ import '../../universe/selector.dart' show
     Selector;
 import '../../world.dart' show
     ClassWorld;
-
+import '../../types/types.dart';
 
 /// Encapsulates the dependencies of the function-compiler to the compiler,
 /// backend and emitter.
@@ -287,5 +287,9 @@ class Glue {
     return _backend.constants.getConstantValueForVariable(elem);
   }
 
+  TypeMask extendMaskIfReachesAll(Selector selector, TypeMask mask) {
+    return _compiler.world.extendMaskIfReachesAll(selector, mask);
+  }
+
   FunctionElement get closureFromTearOff => _backend.helpers.closureFromTearOff;
 }