rs6000.c (struct processor_costs): New structure used to hold instruction latencies...

rs6000.c (struct processor_costs): New structure used to hold instruction latencies/sizes for processor types.

	* config/rs6000/rs6000.c (struct processor_costs): New structure
	used to hold instruction latencies/sizes for processor types.
	(rs6000_cost): New global variable pointing to current CPU's costs.
	(rs6000_override_options): Initialize rs6000_cost to point to the
	appropriate cost table based upon rs6000_cpu and optimize_size.
	(rs6000_rtx_costs): Use rs6000_cost to avoid hardcoding processor
	timings inline.

From-SVN: r84024