gcse.c: Use rtx_insn

gcse.c: Use rtx_insn

gcc/
	* gcse.c (struct occr): Strengthen field "insn" from rtx to
	rtx_insn *.
	(test_insn): Likewise for this global.
	(oprs_unchanged_p): Strengthen param "insn" from const_rtx to
	const rtx_insn *.
	(oprs_anticipatable_p): Likewise.
	(oprs_available_p): Likewise.
	(insert_expr_in_table): Strengthen param "insn" from  rtx to
	rtx_insn *.
	(hash_scan_set): Likewise.
	(hash_scan_clobber): Likewise.
	(hash_scan_call): Likewise.
	(hash_scan_insn): Likewise.
	(compute_hash_table_work): Likewise for local "insn".
	(process_insert_insn): Likewise for return type and local "pat".
	(insert_insn_end_basic_block): Likewise for locals "new_insn",
	"pat", "pat_end", "maybe_cc0_setter".
	(pre_edge_insert): Likewise for local "insn".
	(pre_insert_copy_insn): Likewise for param "insn".
	(pre_insert_copies): Likewise for local "insn".
	(struct set_data): Likewise for field "insn".
	(single_set_gcse): Likewise for param "insn".
	(gcse_emit_move_after): Likewise.
	(pre_delete): Likewise for local "insn".
	(update_bb_reg_pressure): Likewise for param "from" and local
	"insn".
	(should_hoist_expr_to_dom): Likewise for param "from".
	(hoist_code): Likewise for local "insn".
	(get_pressure_class_and_nregs): Likewise for param "insn".
	(calculate_bb_reg_pressure): Likewise for local "insn".
	(compute_ld_motion_mems): Likewise.

From-SVN: r214331