auto-inc-dec.c: strengthen various rtx to rtx_insn *

auto-inc-dec.c: strengthen various rtx to rtx_insn *

gcc/
2014-08-21  David Malcolm  <dmalcolm@redhat.com>

	* auto-inc-dec.c (struct inc_insn): Strengthen field "insn" from
	rtx to rtx_insn *.
	(struct mem_insn): Likewise for field "insn".
	(reg_next_use): Strengthen from rtx * to rtx_insn **.
	(reg_next_inc_use): Likewise.
	(reg_next_def): Likewise.
	(move_dead_notes): Strengthen params "to_insn" and "from_insn"
	from rtx to rtx_insn *.
	(move_insn_before): Likewise for param "next_insn" and local "insns".
	(attempt_change): Likewise for local "mov_insn".
	(try_merge): Likewise for param "last_insn".
	(get_next_ref): Likewise for return type and local "insn".
	Strengthen param "next_array" from rtx * to rtx_insn **.
	(parse_add_or_inc): Strengthen param "insn" from rtx to
	rtx_insn *.
	(find_inc): Likewise for locals "insn" and "other_insn" (three of
	the latter).
	(merge_in_block): Likewise for locals "insn", "curr",
	"other_insn".
	(pass_inc_dec::execute): Update allocations of the arrays to
	reflect the stronger types.

From-SVN: r214285