2084.md: New file.

2084.md: New file.

	* config/s390/2084.md: New file.
	* config/s390/s390.md: Include it.
	* config/s390/s390.c (s390_adjust_priority): New function.
	(TARGET_SCHED_ADJUST_PRIORITY): Define.
	(s390_first_cycle_multipass_dfa_lookahead): New function.
	(TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD): Define.
	(s390_sched_reorder2): New function.
	(TARGET_SCHED_REORDER2): Define.
	(s390_adjust_cost): Support PROCESSOR_2084_Z990 cpu type.
	(s390_issue_rate): Likewise.

Co-Authored-By: Ulrich Weigand <uweigand@de.ibm.com>
From-SVN: r68743