* config/s390/s390.c (s390_address_cost): New function.
	config/s390/s390-protos.h (s390_address_cost): Add prototype.
	config/s390/s390.h (ADDRESS_COST): Call s390_address_cost.
	(RTX_COST): Use COSTS_N_INSNS.

From-SVN: r57282