Update expectations for instance creations to match front_end.

pkg/front_end/testcases/inference/constructors_infer_from_arguments.dart

Index: pkg/front_end/testcases/inference/constructors_infer_from_arguments.dart
diff --git a/pkg/front_end/testcases/inference/constructors_infer_from_arguments.dart b/pkg/front_end/testcases/inference/constructors_infer_from_arguments.dart
index 53a418ec090851fdcc15de25d5fab4588a8b6440..7fec7902813c3ed084543dc7eaf9ea119920c306 100644
--- a/pkg/front_end/testcases/inference/constructors_infer_from_arguments.dart
+++ b/pkg/front_end/testcases/inference/constructors_infer_from_arguments.dart
@@ -11,15 +11,15 @@ class C<T> {
 }
 
 main() {
-  var /*@type=C<int>*/ x = /*@typeArgs=int*/ new C(42);
+  var /*@type=C<int>*/ x = new /*@typeArgs=int*/ C(42);
 
   num y;
-  C<int> c_int = /*@typeArgs=int*/ new C(
+  C<int> c_int = new /*@typeArgs=int*/ C(
       /*info:DOWN_CAST_IMPLICIT*/ /*@promotedType=none*/ y);
 
   // These hints are not reported because we resolve with a null error listener.
-  C<num> c_num = /*@typeArgs=num*/ new C(123);
-  C<num> c_num2 = (/*@typeArgs=num*/ new C(456))..t = 1.0;
+  C<num> c_num = new /*@typeArgs=num*/ C(123);
+  C<num> c_num2 = (new /*@typeArgs=num*/ C(456))..t = 1.0;
 
   // Down't infer from explicit dynamic.
   var /*@type=C<dynamic>*/ c_dynamic = new C<dynamic>(42);