Fix type masks for js-interop types.

pkg/compiler/lib/src/common/resolution.dart

Index: pkg/compiler/lib/src/common/resolution.dart
diff --git a/pkg/compiler/lib/src/common/resolution.dart b/pkg/compiler/lib/src/common/resolution.dart
index ddcd7767fc0d7ba217933f7543467bece7d3ba91..538692a2d9b4f6cfdd7721dfe9909e25a00b4546 100644
--- a/pkg/compiler/lib/src/common/resolution.dart
+++ b/pkg/compiler/lib/src/common/resolution.dart
@@ -98,6 +98,10 @@ abstract class Target {
     return null;
   }
 
+  /// Returns `true` if [element] is a default implementation of `noSuchMethod`
+  /// used by the target.
+  bool isDefaultNoSuchMethod(MethodElement element);
+
   /// Returns the default superclass for the given [element] in this target.
   ClassElement defaultSuperclass(ClassElement element);