fn load_frozen_forks(
    bank_forks: &RwLock<BankForks>,
    start_slot: Slot,
    start_slot_meta: &SlotMeta,
    blockstore: &Blockstore,
    leader_schedule_cache: &LeaderScheduleCache,
    opts: &ProcessOptions,
    transaction_status_sender: Option<&TransactionStatusSender>,
    cache_block_meta_sender: Option<&CacheBlockMetaSender>,
    timing: &mut ExecuteTimings,
    accounts_background_request_sender: &AbsRequestSender
) -> Result<u64, BlockstoreProcessorError>