tests/tcg/s390x: Test STCKF condition code on a faulting store

Add a small test to prevent regressions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20260714203206.363028-3-iii@linux.ibm.com
Signed-off-by: Eric Farman <farman@linux.ibm.com>
2 files changed