x32 does not support MS ABI, skip testcases that require it.

	* testsuite/20_util/bind/91371.cc: Skip for x32.
	* testsuite/20_util/is_function/91371.cc: Ditto.
	* testsuite/20_util/is_member_function_pointer/91371.cc: Ditto.
	* testsuite/20_util/is_object/91371.cc: Ditto.

libstdc++-v3/testsuite/20_util/bind/91371.cc

@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-do compile { target { { i?86-*-* x86_64-*-* } && { ! x32 } } } }
 // { dg-require-effective-target c++11 }
 
 #include <functional>

libstdc++-v3/testsuite/20_util/is_function/91371.cc

@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-do compile { target { { i?86-*-* x86_64-*-* } && { ! x32 } } } }
 // { dg-require-effective-target c++11 }
 
 #include <type_traits>

libstdc++-v3/testsuite/20_util/is_member_function_pointer/91371.cc

@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-do compile { target { { i?86-*-* x86_64-*-* } && { ! x32 } } } }
 // { dg-require-effective-target c++11 }
 
 #include <type_traits>

libstdc++-v3/testsuite/20_util/is_object/91371.cc

@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-do compile { target { { i?86-*-* x86_64-*-* } && { ! x32 } } } }
 // { dg-require-effective-target c++11 }
 
 #include <type_traits>