Move test infer_use_of_void to inference_new

pkg/front_end/testcases/inference/infer_use_of_void_local.dart

Index: pkg/front_end/testcases/inference/infer_use_of_void_local.dart
diff --git a/pkg/front_end/testcases/inference/infer_use_of_void.dart b/pkg/front_end/testcases/inference/infer_use_of_void_local.dart
similarity index 59%
copy from pkg/front_end/testcases/inference/infer_use_of_void.dart
copy to pkg/front_end/testcases/inference/infer_use_of_void_local.dart
index a8b29c19db08bab9892fd63d5d40eba3868d9fb8..e6e32e83f375f32939ab30e08e1d1eb4c004abd9 100644
--- a/pkg/front_end/testcases/inference/infer_use_of_void.dart
+++ b/pkg/front_end/testcases/inference/infer_use_of_void_local.dart
@@ -5,17 +5,10 @@
 /*@testedFeatures=inference*/
 library test;
 
-class B {
-  void f() {}
-}
+void f() {}
 
-class C extends B {
-  /*@topType=void*/ f() {}
+void g() {
+  var /*@type=void*/ x = f();
 }
 
-var /*@topType=dynamic*/ x =
-    new C(). /*info:USE_OF_VOID_RESULT*/ /*@target=C::f*/ f();
-
-main() {
-  x;
-}
+main() {}