Set MethodInvocation.interfaceTarget during type inference.

pkg/front_end/testcases/inference/block_bodied_lambdas_nested_lambdas.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;
 
 main() {
   var /*@type=() -> (int) -> double*/ f = /*@returnType=(int) -> double*/ () {
     return /*@returnType=double*/ (int x) {
-      return 2.0 * /*@promotedType=none*/ x;
+      return 2.0 /*@target=double::**/ * /*@promotedType=none*/ x;
     };
   };
 }