Update bswap64-4 test for desired results

Update existing testcase powerpc/bswap64-4.c to
reflect that we generate ldbrx and stdbrx instructions
for newer cpu targets, versus the pair of lwbrx and stwbrx
instructions as seen on previous cpu targets.

2020-03-24  Will Schmidt  <will_schmidt@vnet.ibm.com>

gcc/testsuite/
	* gcc.target/powerpc/bswap64-4.c: Update scan-assembler
	expected results.

gcc/testsuite/ChangeLog

+2020-03-30  Will Schmidt  <will_schmidt@vnet.ibm.com>
+
+	* gcc.target/powerpc/bswap64-4.c: Update scan-assembler
+	expected results.
+
 2020-03-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/94343

gcc/testsuite/gcc.target/powerpc/bswap64-4.c

@@ -2,8 +2,10 @@
 /* { dg-skip-if "" { powerpc*-*-aix* } } */
 /* { dg-options "-O2 -mpowerpc64" } */
 /* { dg-require-effective-target ilp32 } */
-/* { dg-final { scan-assembler-times "lwbrx" 2 } } */
-/* { dg-final { scan-assembler-times "stwbrx" 2 } } */
+/* { dg-final { scan-assembler-times "lwbrx" 2 { target { ! has_arch_pwr7 } } } } */
+/* { dg-final { scan-assembler-times "stwbrx" 2 { target { ! has_arch_pwr7 } } } } */
+/* { dg-final { scan-assembler-times "ldbrx" 1 { target has_arch_pwr7 } } } */
+/* { dg-final { scan-assembler-times "stdbrx" 1 { target has_arch_pwr7 } } } */
 
 long long swap_load (long long *a) { return __builtin_bswap64 (*a); }
 long long swap_reg (long long a) { return __builtin_bswap64 (a); }