fix optional params to mock methods, allow all signatures

test/codegen_expected/language/no_such_method_subtype_test.js

Index: test/codegen_expected/language/no_such_method_subtype_test.js
diff --git a/test/codegen_expected/language/no_such_method_subtype_test.js b/test/codegen_expected/language/no_such_method_subtype_test.js
index 7d2c5cf41a15788e6e170b92ca70bc1c5cb2528f..57d67ccdd93abe149fe7f05c8ba0652fa28c8868 100644
--- a/test/codegen_expected/language/no_such_method_subtype_test.js
+++ b/test/codegen_expected/language/no_such_method_subtype_test.js
@@ -23,8 +23,8 @@ dart_library.library('language/no_such_method_subtype_test', null, /* Imports */
     noSuchMethod(im) {
       return 84;
     }
-    foo() {
-      return this.noSuchMethod(new dart.InvocationImpl('foo', [], {isMethod: true}));
+    foo(...args) {
+      return this.noSuchMethod(new dart.InvocationImpl('foo', args, {isMethod: true}));
     }
   };
   no_such_method_subtype_test.B[dart.implements] = () => [no_such_method_subtype_test.A];