Set MethodInvocation.interfaceTarget during type inference.

pkg/front_end/testcases/inference/infer_statics_with_method_invocations.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;
 
 import 'infer_statics_with_method_invocations_a.dart';
 
 class T {
-  static final T foo = m1(m2(m3('', '')));
+  static final T foo = /*@target=T::m1*/ m1(/*@target=T::m2*/ m2(m3('', '')));
   static T m1(String m) {
     return null;
   }
 
   static String m2(e) {
     return '';
   }
 }
 
 main() {}