combine-stack-adj.c: Use rtx_insn

combine-stack-adj.c: Use rtx_insn

gcc/
2014-08-22  David Malcolm  <dmalcolm@redhat.com>

	* combine-stack-adj.c (struct csa_reflist): Strengthen field
	"insn" from rtx to rtx_insn *.
	(single_set_for_csa): Likewise for param "insn".
	(record_one_stack_ref): Likewise.
	(try_apply_stack_adjustment): Likewise.
	(struct record_stack_refs_data): Likewise for field "insn".
	(maybe_move_args_size_note): Likewise for params "last" and "insn".
	(prev_active_insn_bb): Likewise for return type and param "insn".
	(next_active_insn_bb): Likewise.
	(force_move_args_size_note): Likewise for params "prev" and "last"
	and locals "test", "next_candidate", "prev_candidate".
	(combine_stack_adjustments_for_block): Strengthen locals
	"last_sp_set", "last2_sp_set", "insn", "next" from rtx to
	rtx_insn *.

From-SVN: r214301