Replace insn_rtx_cost with insn_cost and pattern_cost

Replace insn_rtx_cost with insn_cost and pattern_cost

This replaces insn_rtx_cost with insn_cost if an insn is readily
available, and with pattern_cost otherwise.

	* cfgrtl.c (rtl_account_profile_record): Replace insn_rtx_cost with
	insn_cost.
	* combine.c (uid_insn_cost): Adjust comment.
	(combine_validate_cost): Adjust comment.  Use pattern_cost instead
	of insn_rtx_cost
	(combine_instructions): Use insn_cost instead of insn_rtx_cost.
	* dse.c (find_shift_sequence): Ditto.
	* ifcvt.c (cheap_bb_rtx_cost_p): Ditto.
	(bb_valid_for_noce_process_p): Use pattern_cost.
	* rtl.h (insn_rtx_cost): Delete.
	(pattern_cost): New prototype.
	(insn_cost): New prototype.
	* rtlanal.c (insn_rtx_cost): Rename to...
	(pattern_cost): ... this.
	(insn_cost): New.

From-SVN: r253560