Add whitespace to some dejagnu directives in libstdc++ tests

	* testsuite/20_util/add_rvalue_reference/requirements/alias_decl.cc:
	Add whitespace to dejagnu directive.
	* testsuite/23_containers/array/element_access/at_neg.cc: Likewise.

From-SVN: r262245

libstdc++-v3/ChangeLog

+2018-06-29  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/20_util/add_rvalue_reference/requirements/alias_decl.cc:
+	Add whitespace to dejagnu directive.
+	* testsuite/23_containers/array/element_access/at_neg.cc: Likewise.
+
 2018-06-27  François Dumont  <fdumont@gcc.gnu.org>
 
 	* include/bits/stl_vector.h

libstdc++-v3/testsuite/20_util/add_rvalue_reference/requirements/alias_decl.cc

-// { dg-do compile {target c++14 } }
+// { dg-do compile { target c++14 } }
 
 // Copyright (C) 2013-2018 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/23_containers/array/element_access/at_neg.cc

-// { dg-do run {target c++11 xfail *-*-* } }
+// { dg-do run { target c++11 xfail *-*-* } }
 
 // Copyright (C) 2011-2018 Free Software Foundation, Inc.
 //