accept null type casts in dummy noSuchMethod checks

pkg/compiler/lib/src/js_backend/no_such_method_registry.dart

Index: pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
diff --git a/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart b/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
index 4bc53840c9c0513f130397c9ef55ac88305f63a5..bc57616870e054bebb40dad00c2c7b24b2f4b8a1 100644
--- a/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
+++ b/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
@@ -207,6 +207,11 @@ class NoSuchMethodRegistry {
       }
     }
     if (expr is Send &&
+        expr.isTypeCast &&
+        expr.typeAnnotationFromIsCheckOrCast.typeName.source == "dynamic") {
+      expr = expr.receiver;
+    }
+    if (expr is Send &&
         expr.isSuperCall &&
         expr.selector is Identifier &&
         (expr.selector as Identifier).source == Identifiers.noSuchMethod_) {