[gcc(refs/vendors/ARM/heads/morello)] morello testsuite: Fix up const-null.c test

[Alex Coplan]

https://gcc.gnu.org/g:d11f8e14fe75fd148e42464cc0b489e2de8b7574

commit d11f8e14fe75fd148e42464cc0b489e2de8b7574
Author: Alex Coplan <alex.coplan@arm.com>
Date:   Tue Nov 8 13:42:03 2022 +0000

    morello testsuite: Fix up const-null.c test
    
    For this test, when compiling for base AArch64 we generate mov x0, 0,
    but on purecap we generate mov x0, xzr. Either is fine, so accept both
    in the check-function-bodies pattern.

Diff:
---
 gcc/testsuite/gcc.target/aarch64/morello/const-null.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.target/aarch64/morello/const-null.c b/gcc/testsuite/gcc.target/aarch64/morello/const-null.c
index dc7d186e2e8..815987254d3 100644
--- a/gcc/testsuite/gcc.target/aarch64/morello/const-null.c
+++ b/gcc/testsuite/gcc.target/aarch64/morello/const-null.c
@@ -7,7 +7,7 @@
 
 /*
 ** test_ret:
-**	mov	x0, xzr
+**	mov	x0, (0|xzr)
 **	ret
 */
 void*