cselib and incdec

gcc/
	* rtl.h (for_each_inc_dec): Strengthen param 1 from rtx * to
	rtx_insn **.
	(check_for_inc_dec): Strengthen param "insn" from rtx to
	rtx_insn *.

	* cselib.h (cselib_process_insn): Likewise.

	* cselib.c (cselib_record_sets): Likewise.
	(cselib_process_insn): Likewise.

	* dse.c (struct insn_info): Likewise for field "insn".
	(check_for_inc_dec_1): Likewise for local "insn".
	(check_for_inc_dec): Likewise for param "insn".
	(scan_insn): Likewise.
	(dse_step1): Likewise for local "insn".

	* rtlanal.c (for_each_inc_dec): Strengthen param 1 from rtx * to
	rtx_insn **.  Use for_each_rtx_in_insn rather than for_each_rtx.

From-SVN: r214531