This is to track the regression introduced in master, which needs fixing for 0.14. See #9240, #9371, etc.
CTxMemPool::ReadFeeEstimates(CAutoFile& filein)
{
    try {
        int nVersionRequired, nVersionThatWrote;
        filein >> nVersionRequired >> nVersionThatWrote;
        if (nVersionRequired > CLIENT_VERSION)
            return error("CTxMemPool::ReadFeeEstimates(): up-version (%d) fee estimate file", nVersionRequired);
        LOCK(cs);
        minerPolicyEstimator->Read(filein, nVersionThatWrote);
    }
    catch (const std::exception&) {
        LogPrintf("CTxMemPool::ReadFeeEstimates(): unable to read policy estimator data (non-fatal)\n");
        return false;
    }
    return true;
}
void CTxMemPool::PrioritiseTransaction(const uint256 hash, const string strHash, double dPriorityDelta, const CAmount& nFeeDelta)