extern void set_stack_check_libfunc (rtx);
extern HOST_WIDE_INT trunc_int_for_mode (HOST_WIDE_INT, enum machine_mode);
extern rtx plus_constant (rtx, HOST_WIDE_INT);
-extern void optimize_save_area_alloca (void);
/* In emit-rtl.c */
extern rtvec gen_rtvec (int, ...);