Enable support for next generation AMD Zen CPU, via -march=znver2.

Enable support for next generation AMD Zen CPU, via -march=znver2.

gcc/ChangeLog:
	* common/config/i386/i386-common.c (processor_alias_table): Add znver2 entry.
	* config.gcc (i[34567]86-*-linux* | ...): Add znver2.
	(case ${target}): Add znver2.
	* config/i386/driver-i386.c: (host_detect_local_cpu): Let
	-march=native recognize znver2 processors.
	* config/i386/i386-c.c (ix86_target_macros_internal): Add znver2.
	* config/i386/i386.c (m_znver2): New definition.
	(m_ZNVER): New definition.
	(m_AMD_MULTIPLE): Includes m_znver2.
	(processor_cost_table): Add znver2 entry.
	(processor_target_table): Add znver2 entry.
	(get_builtin_code_for_version): Set priority for
	PROCESSOR_ZNVER2.
	(processor_model): Add M_AMDFAM17H_ZNVER2.
	(arch_names_table): Ditto.
	(ix86_reassociation_width): Include znver2.
	* config/i386/i386.h (TARGET_znver2): New definition.
	(struct ix86_size_cost): Add TARGET_ZNVER2.
	(enum processor_type): Add PROCESSOR_ZNVER2.
	* config/i386/i386.md (define_attr "cpu"): Add znver2.
	* config/i386/x86-tune-costs.h: (processor_costs) Add znver2 costs.
	* config/i386/x86-tune-sched.c: (ix86_issue_rate): Add znver2.
	(ix86_adjust_cost): Add znver2.
	* config/i386/x86-tune.def:  Replace m_ZNVER1 by m_ZNVER
	* gcc/doc/extend.texi: Add details about znver2.
	* gcc/doc/invoke.texi: Add details about znver2.

libgcc/ChangeLog
	* config/i386/cpuinfo.c: (get_amd_cpu): Add znver2.
	* config/i386/cpuinfo.h(processor_subtypes): Ditto.

From-SVN: r265775