Fix invalid dg-do directive

	* testsuite/20_util/reference_wrapper/invoke-2.cc: Fix invalid dg-do
	directive and use effective target instead of dg-options.

From-SVN: r239548

libstdc++-v3/ChangeLog

 2016-08-17  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/reference_wrapper/invoke-2.cc: Fix invalid dg-do
+	directive and use effective target instead of dg-options.
+
 	* testsuite/20_util/hash/chi2_q_bit_flip_set.cc: Use effective target
 	instead of -std in dg-options.
 	* testsuite/20_util/hash/chi2_q_bit_string_set.cc: Likewise.

libstdc++-v3/testsuite/20_util/reference_wrapper/invoke-2.cc

-// { dg-options "-std=gnu++11" }
-// { dg-do compile}
+// { dg-do compile { target c++11 } }
 // Copyright (C) 2011-2016 Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free