[Committed] S/390: Support z14 as CPU name.

[Committed] S/390: Support z14 as CPU name.

With IBM z14 officially announced we can add support for z14 as
preferred CPU name.  We still pass arch12 to Binutils in order to keep
older Binutils versions supported.

gcc/ChangeLog:

2017-07-31  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config.gcc: Add z14.
	* config/s390/driver-native.c (s390_host_detect_local_cpu): Add
	CPU model numbers for z13s and z14.
	* config/s390/s390-c.c (s390_resolve_overloaded_builtin): Replace
	arch12 with z14.
	* config/s390/s390-opts.h (enum processor_type): Rename
	PROCESSOR_ARCH12 to PROCESSOR_3906_Z14.
	* config/s390/s390.c (processor_table): Add field for CPU name to
	be passed to Binutils.
	(s390_asm_output_machine_for_arch): Use the new field in
	processor_table for Binutils.
	(s390_expand_builtin): Replace arch12 with z14.
	(s390_issue_rate): Rename PROCESSOR_ARCH12 to PROCESSOR_3906_Z14.
	(s390_get_sched_attrmask): Likewise.
	(s390_get_unit_mask): Likewise.
	* config/s390/s390.opt: Add z14 to processor_type enum.

From-SVN: r250739