Fix invalid dg-do directives in libstdc++ tests

	* testsuite/22_locale/conversions/string/1.cc: Remove unintended
	dg-do compile directive.
	* testsuite/26_numerics/headers/cmath/fabs_inline.cc: Fix syntax of
	dg-do directive.
	* testsuite/26_numerics/valarray/const_bracket.cc: Likewise.

From-SVN: r238834

libstdc++-v3/ChangeLog

+2016-07-28  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/22_locale/conversions/string/1.cc: Remove unintended
+	dg-do compile directive.
+	* testsuite/26_numerics/headers/cmath/fabs_inline.cc: Fix syntax of
+	dg-do directive.
+	* testsuite/26_numerics/valarray/const_bracket.cc: Likewise.
+
 2016-07-28  Ville Voutilainen  <ville.voutilainen@gmail.com>
 
 	Implement std::string_view and P0254r2,

libstdc++-v3/testsuite/22_locale/conversions/string/1.cc

-// { dg-do compile }
 // { dg-options "-std=gnu++11" }
 
 // Copyright (C) 2015-2016 Free Software Foundation, Inc.

libstdc++-v3/testsuite/26_numerics/headers/cmath/fabs_inline.cc

@@ -17,7 +17,7 @@
 
 // Test to see whether the host provides its own (inline) view of fabs.
 // Origin: Kurt Garloff <kurt@garloff.de>, 2001-05-24
-// dg-do link
+// { dg-do link }
 
 #include <cmath>
 #include <cstdio>

libstdc++-v3/testsuite/26_numerics/valarray/const_bracket.cc

@@ -20,7 +20,7 @@
 
 #include <valarray>
 
-// dg-do compile
+// { dg-do compile }
 
 template<typename P>
   void copy(P, std::size_t) { }