* config/i386/i386.c (COSTS_N_BYTES): New macro.
	(size_cost): Encode costs in bytes so that a reg-reg addition is
	equivalent to COSTS_N_INSNS(1).
	(override_options): Use the size_cost.branch_cost as the default
	ix86_branch_cost when optimizing for size.

From-SVN: r109867