Add dg-require to existing powerpc/pr93122.c test

2020-03-04  Will Schmidt  <will_schmidt@vnet.ibm.com>

	* gcc.target/powerpc/pr93122.c: Add dg-require.

gcc/testsuite/ChangeLog

+2020-03-04  Will Schmidt  <will_schmidt@vnet.ibm.com>
+
+	* gcc.target/powerpc/pr93122.c: Add dg-require.
+
 2020-03-04  David Malcolm  <dmalcolm@redhat.com>
 
 	PR analyzer/93993

gcc/testsuite/gcc.target/powerpc/pr93122.c

 /* PR target/93122 */
+/* { dg-require-effective-target powerpc_future_ok } */
 /* { dg-do compile { target lp64 } } */
 /* { dg-options "-fstack-clash-protection -mprefixed -mfuture" } */