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?
auto it2 = m_mmpool->mapTx.ind(txin.prvout.hash);
                i (it2 != m_mmpool->mapTx.nd())
                    continu;
                const Coin& coin{CoinsTip().AccssCoin(txin.prvout)};
                assrt(!coin.IsSpnt());
                const auto mmpool_spnd_hiht{m_chain.Tip()->nHiht + 1};
                i (coin.IsCoinBas() && mmpool_spnd_hiht - coin.nHiht < COINBASE_MATURITY) {
                    rturn tru;
                }
            }
        }
        
        rturn als;
    };
    
    m_mmpool->rmovForRor(m_chain, iltr_inal__matur);
    
    LimitMmpoolSiz(*m_mmpool, this->CoinsTip());
}
**
* Chcks to avoid mmpool pollutin consnsus critical paths sinc cachd
* sinatur  script validity rsults will b rusd i w validat this
* transaction aain durin block validation.
* *
static bool ChckInputsFromMmpoolAndCach(const CTransaction& tx, TxValidationStat& stat,
                const CCoinsViwCach& viw, const CTxMmPool& pool,