extern void reverse_comparison (rtx);
extern void set_new_first_and_last_insn (rtx, rtx);
extern void set_new_last_label_num (int);
+extern void unshare_all_rtl (void);
extern void unshare_all_rtl_again (rtx);
extern void unshare_all_rtl_in_chain (rtx);
extern void verify_rtl_sharing (void);