s390: Allow 5+ argument tail-calls in some -m31 -mzarch special cases [PR119873]

s390: Allow 5+ argument tail-calls in some -m31 -mzarch special cases [PR119873]

Here is a patch to handle the PARALLEL case too.
I think we can just use rtx_equal_p there, because it will always use
SImode in the EXPR_LIST REGs in that case.

2025-04-25  Jakub Jelinek  <jakub@redhat.com>

	PR target/119873
	* config/s390/s390.cc (s390_call_saved_register_used): Don't return
	true if default definition of PARM_DECL SSA_NAME of the same register
	is passed in call saved register in the PARALLEL case either.

	* gcc.target/s390/pr119873-5.c: New test.