ifcvt.c: Use rtx_insn

ifcvt.c: Use rtx_insn

gcc/
	* ifcvt.c (count_bb_insns): Strengthen local "insn" from rtx to
	rtx_insn *.
	(cheap_bb_rtx_cost_p): Likewise.
	(first_active_insn): Likewise for return type and local "insn".
	(last_active_insn):  Likewise for return type and locals "insn",
	"head".
	(struct noce_if_info): Likewise for fields "jump", "insn_a",
	"insn_b".
	(end_ifcvt_sequence): Likewise for return type and locals "insn",
	"seq".
	(noce_try_move): Likewise for local "seq".
	(noce_try_store_flag): Likewise.
	(noce_try_store_flag_constants): Likewise.
	(noce_try_addcc): Likewise.
	(noce_try_store_flag_mask): Likewise.
	(noce_try_cmove): Likewise.
	(noce_try_minmax): Likewise.
	(noce_try_abs): Likewise.
	(noce_try_sign_mask): Likewise.
	(noce_try_bitop): Likewise.
	(noce_can_store_speculate_p): Likewise for local "insn".
	(noce_process_if_block): Likewise for locals "insn_a", "insn_b",
	seq".
	(check_cond_move_block): Likewise for local "insn".
	(cond_move_convert_if_block): Likewise.
	(cond_move_process_if_block): Likewise for locals "seq",
	"loc_insn".
	(noce_find_if_block): Likewise for local "jump".
	(merge_if_block): Likewise for local "last".
	(block_jumps_and_fallthru_p): Likewise for locals "insn", "end".
	(find_cond_trap): Likewise for locals "trap", "jump", "newjump".
	(block_has_only_trap): Likewise for return type and local "trap".
	(find_if_case_1): Likewise for local "jump".
	(dead_or_predicable): Likewise for locals "head", "end", "jump",
	"insn".

From-SVN: r214335