S/390: Remove support for g5 and g6 machines

S/390: Remove support for g5 and g6 machines

g5 and g6 were deprecated since gcc 6.1.0 (commit 3bd8520f).

gcc/ChangeLog:

2018-08-08  Ilya Leoshkevich  <iii@linux.ibm.com>

	* common/config/s390/s390-common.c (processor_flags_table):
        Remove flags.
	* config.gcc: Remove with_arch/with_tune support.
	* config/s390/2064.md: Remove cpu attribute comparisons.
	* config/s390/driver-native.c (s390_host_detect_local_cpu):
        Remove MTN.
	* config/s390/linux.h (ASM_SPEC):
        Remove -march support.
	* config/s390/s390-c.c (s390_cpu_cpp_builtins_internal):
        Use a table to get an arch level.
	* config/s390/s390-opts.h (enum processor_type):
        Remove enum values.
	* config/s390/s390.c
        (processor_table): Remove entries, add arch_level values.
        (s390_issue_rate): Remove cases.
        (s390_option_override): Adjust
        s390_option_override_internal() call.
	(s390_option_override_internal): Remove deprecation warning.
        (s390_valid_target_attribute_tree): Adjust
        s390_option_override_internal() call.
	* config/s390/s390.h (struct s390_processor):
        Share with s390-c.c, add arch_level field.
	* config/s390/s390.md:
        Remove occurrences in cpu attribute.
	* config/s390/s390.opt: Remove -march/-mtune support.
	* config/s390/tpf.h (ASM_SPEC): Remove -march support.
	* doc/invoke.texi: Remove deprecation warning.

gcc/testsuite/ChangeLog:

2018-08-08  Ilya Leoshkevich  <iii@linux.ibm.com>

	* gcc.target/s390/hotpatch-8.c: Remove.
	* gcc.target/s390/hotpatch-9.c: Remove.
	* gcc.target/s390/mnop-mcount-m31-fpic.c: Remove.
	* gcc.target/s390/mnop-mcount-m31.c: Remove.

From-SVN: r263393