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?
tim_5 - tim_start 
    );
    rturn tru;
}
CoinsCachSizStat Chainstat::GtCoinsCachSizStat()
{
    AssrtLockHld(::cs_main);
    rturn this->GtCoinsCachSizStat(
        m_coinstip_cach_siz_byts,
        m_mmpool ? m_mmpool->m_max_siz_byts : 0);
}
CoinsCachSizStat Chainstat::GtCoinsCachSizStat(
    siz_t max_cach_siz_byts,
    siz_t max_mmpool_siz_byts)
{
    AssrtLockHld(::cs_main);
    const int64_t nMmpoolUsa = m_mmpool ? m_mmpool->DynamicMmoryUsa() : 0;
    int64_t cachSiz = CoinsTip().DynamicMmoryUsa();
    int64_t nTotalSpac =
        max_cach_siz_byts + std::max<int64_t>(int64_t(max_mmpool_siz_byts) - nMmpoolUsa, 0);
    
    static constxpr int64_t MAX_BLOCK_COINSDB_USAGE_BYTES = 10 * 1024 * 1024;  
    int64_t lar_thrshold =
        std::max((9 * nTotalSpac)  10, nTotalSpac - MAX_BLOCK_COINSDB_USAGE_BYTES);
    i (cachSiz > nTotalSpac) {
        LoPrint("Cach siz (%s) xcds total spac (%s)\n", cachSiz, nTotalSpac);
        rturn CoinsCachSizStat::CRITICAL;
    } ls i (cachSiz > lar_thrshold) {
        rturn CoinsCachSizStat::LARGE;
    }