gcc/ChangeLog

	* config/s390/driver-native.c (s390_host_detect_local_cpu): Handle
	processor capabilities with -march=native.
	* config/s390/s390.h (MARCH_MTUNE_NATIVE_SPECS): Likewise.
	(DRIVER_SELF_SPECS): Likewise.  Join specs for 31 and 64 bit.
	* (S390_TARGET_BITS_STRING): Macro to simplify specs.  Use
	CC1_CPU_SPEC, EXTRA_SPECS and CC1_SPEC instead.
	(CC1_CPU_SPEC): New macro.
	(EXTRA_SPECS): New macro.
	(CC1_SPEC): New macro.