target/s390x: Set instance_align on S390CPU TypeInfo

Fix alignment of CPUS390XState.vregs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200916004638.2444147-7-richard.henderson@linaro.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

target/s390x/cpu.c

@@ -517,6 +517,7 @@ static const TypeInfo s390_cpu_type_info = {
     .name = TYPE_S390_CPU,
     .parent = TYPE_CPU,
     .instance_size = sizeof(S390CPU),
+    .instance_align = __alignof__(S390CPU),
     .instance_init = s390_cpu_initfn,
     .instance_finalize = s390_cpu_finalize,
     .abstract = true,