s390: Add scheduler description for z16.
This patch adds the scheduler description for the z16 machine.
gcc/ChangeLog:
* config/s390/s390.cc (s390_get_sched_attrmask): Add z16.
(s390_get_unit_mask): Likewise.
(s390_is_fpd): Likewise.
(s390_is_fxd): Likewise.
* config/s390/s390.h (s390_tune_attr): Set max tune level to z16.
* config/s390/s390.md (z900,z990,z9_109,z9_ec,z10,z196,zEC12,z13,z14,z15):
Add z16.
(z900,z990,z9_109,z9_ec,z10,z196,zEC12,z13,z14,z15,z16):
Likewise.
* config/s390/3931.md: New file.