* rtl.h (subrtx_p): Renamed to rtx_referenced_p.
	(rtx_pair): Added new element update_label_nuses, renamed to
	replace_label_data.
	* cfgcleanup.c (outgoing_edges_match, try_crossjump_to_edge): Use
	replace_label_data instead of rtx_pair.
	* loop.c (load_mems): Likewise.
	* rtlanal.c (replace_label): Replace label in pool constants and in
	INSN_LIST (in REG_LABEL note).
	(subrtx_p): Renamed to rtx_referenced_p.
	(subrtx_p_1): Renamed to rtx_referenced_p_1, compare the interior of
	LABEL_REF with CODE_LABEL, traverse constants from pool.

From-SVN: r64419