df-*.c: Use rtx_insn

df-*.c: Use rtx_insn

gcc/
	* df-core.c (df_bb_regno_first_def_find): Strengthen local "insn"
	from rtx to rtx_insn *.
	(df_bb_regno_last_def_find): Likewise.

	* df-problems.c (df_rd_bb_local_compute): Likewise.
	(df_lr_bb_local_compute): Likewise.
	(df_live_bb_local_compute): Likewise.
	(df_chain_remove_problem): Likewise.
	(df_chain_create_bb): Likewise.
	(df_word_lr_bb_local_compute): Likewise.
	(df_remove_dead_eq_notes): Likewise for param "insn".
	(df_note_bb_compute): Likewise for local "insn".
	(simulate_backwards_to_point): Likewise.
	(df_md_bb_local_compute): Likewise.

	* df-scan.c (df_scan_free_bb_info): Likewise.
	(df_scan_start_dump): Likewise.
	(df_scan_start_block): Likewise.
	(df_install_ref_incremental): Likewise for local "insn".
	(df_insn_rescan_all): Likewise.
	(df_reorganize_refs_by_reg_by_insn): Likewise.
	(df_reorganize_refs_by_insn_bb): Likewise.
	(df_recompute_luids): Likewise.
	(df_bb_refs_record): Likewise.
	(df_update_entry_exit_and_calls): Likewise.
	(df_bb_verify): Likewise.

From-SVN: r214318