* config/alpha/driver-alpha.c (IMPLVER_EV4_FAMILY,
	IMPLVER_EV5_FAMILY, IMPLVER_EV6_FAMILY, IMPLVER_EV7_FAMILY): Define.
	(AMASK_BWX, AMASK_FIX, AMASK_CIX, AMASK_MVI, AMASK_PRECISE,
	AMASK_LOCKPFTCHOK): Define.
	(host_detect_local_cpu): Remove buf, f, cpu_names.
	Define cpu_types, implver, amask.
	Use __builtin_alpha_implver, __builtin_alpha_amask to determine
	native CPU.
	* config.host: Also use driver-alpha.o, alpha/x-alpha on
	alpha*-dec-osf*.
	* config/alpha/osf5.h [__alpha__ || __alpha]
	(host_detect_local_cpu): Declare.
	(EXTRA_SPEC_FUNCTIONS, MCPU_MTUNE_NATIVE_SPECS)
	(DRIVER_SELF_SPECS): Define.

From-SVN: r176926