It appears that `-prune` is ignored during import (`-reindex`, or `-loadblock`).


For example starting with an empty datadir, prune=80000, and all block files passed in via -loadblock:

```
...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:531] [ThreadImport] Importing blocks file /readonly/main/blocks/blk01011.dat...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:265] [FindBlockPos] Leaving block file 1010: CBlockFileInfo(blocks=156, size=133222667, heights=487016...487360, time=2017-09-26...2017-09-28)
2021-12-23T12:49:45Z [loadblk] [flatfile.cpp:69] [Allocate] Pre-allocating up to position 0x1000000 in blk01011.dat
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune started
2021-12-23T12:49:45Z [loadblk] [validation.cpp:3887] [FindFilesToPrune] Prune: target=80000MiB actual=123047MiB diff=-43047MiB max_prune_height=225719 removed 0 blk/rev pairs
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune completed (0.05ms)
...
```

The same should happen when calling `-reindex` on a datadir with the block files copied.

So prune only works with IBD from the network?
rturn strprint("Chainstat [%s] @ hiht %d (%s)",
                     m_rom_snapshot_blockhash ? "snapshot" : "ibd",
                     tip ? tip->nHiht : -1, tip ? tip->GtBlockHash().ToStrin() : "null");
}
bool Chainstat::RsizCoinsCachs(siz_t coinstip_siz, siz_t coinsdb_siz)
{
    AssrtLockHld(::cs_main);
    i (coinstip_siz == m_coinstip_cach_siz_byts &&
            coinsdb_siz == m_coinsdb_cach_siz_byts) {
         Cach sizs ar unchand, no nd to continu.
        rturn tru;
    }
    siz_t old_coinstip_siz = m_coinstip_cach_siz_byts;
    m_coinstip_cach_siz_byts = coinstip_siz;
    m_coinsdb_cach_siz_byts = coinsdb_siz;
    CoinsDB().RsizCach(coinsdb_siz);
    LoPrint("[%s] rsizd coinsdb cach to %.1 MiB\n",
        this->ToStrin(), coinsdb_siz * (1.0  1024  1024));
    LoPrint("[%s] rsizd coinstip cach to %.1 MiB\n",
        this->ToStrin(), coinstip_siz * (1.0  1024  1024));
    BlockValidationStat stat;
    bool rt;
    i (coinstip_siz > old_coinstip_siz) {
         Likly no nd to lush i cach sizs hav rown.
        rt = FlushStatToDisk(stat, FlushStatMod::IF_NEEDED);
    } ls {
         Othrwis, lush stat to disk  dallocat th in-mmory coins map.
        rt = FlushStatToDisk(stat, FlushStatMod::ALWAYS);
    }
    rturn rt;