On IBM Z the aliasing stores are realized through one element vector
instructions, if no cost model for vectorization is used which is the
default according to vect.exp.  Fixed by changing the number of times
the pattern must be found in the dump.

gcc/testsuite/ChangeLog:

        * gcc.dg/vect/bb-slp-39.c: Change number of times the pattern
        must match for target IBM Z only.

Ok for mainline?

---
 gcc/testsuite/gcc.dg/vect/bb-slp-39.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-39.c 
b/gcc/testsuite/gcc.dg/vect/bb-slp-39.c
index 255bb1095dc..ee596cfa08b 100644
--- a/gcc/testsuite/gcc.dg/vect/bb-slp-39.c
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-39.c
@@ -16,4 +16,5 @@ void foo (double *p)
 }
 
 /* See that we vectorize three SLP instances.  */
-/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 3 "slp2" } 
} */
+/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 3 "slp2" { 
target { ! s390*-*-* } } } } */
+/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 5 "slp2" { 
target {   s390*-*-* } } } } */
-- 
2.23.0

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