Fix annotation of generic method invocations in Fasta inference tests.

pkg/front_end/testcases/inference/generic_methods_uses_greatest_lower_bound.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /*@testedFeatures=inference*/
 library test;
 
 typedef Iterable<num> F(int x);
 typedef List<int> G(double x);
 
 T generic<T>(a(T _), b(T _)) => null;
 
 main() {
-  var /*@type=(num) -> List<int>*/ v = generic(
+  var /*@type=(num) -> List<int>*/ v = /*@typeArgs=(num) -> List<int>*/ generic(
       /*@returnType=dynamic*/ (F f) => null,
       /*@returnType=dynamic*/ (G g) => null);
 }