* sh-protos.h (sh_pr_n_sets): Declare.
* sh.c (calc_live_regs): If the initial value for PR has been copied,
look at the copy to determine if PR needs to be saved.
sh_pr_n_sets: New function.
* sh.h (RETURN_ADDR_RTX): Use get_hard_reg_initial_val.
(ALLOCATE_INITIAL_VALUE): Define.