`validation_flush_tests/getcoinscachesizestate` fails on RISCV-64 on master:
```
Running 394 test cases...
test/validation_flush_tests.cpp(99): error: in "validation_flush_tests/getcoinscachesizestate": check chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 0) == CoinsCacheSizeState::OK has failed [1 != 0]

*** 1 failure is detected in the test module "Bitcoin Core Test Suite"
```
Haven't investigated why, yet. Apart from the architecture it could also be some dependency version causing the problem (this is a fedora rawhide install with very new versions of everything including gcc and boost).

Edit: see below, this is likely due to a newer `libstdc++`
t.vin.clear();
    t.vin.resize(2438); 
    t.vout[0].scriptPubKey = CScript() << OP_RETURN << std::vector<unsigned char>(19, 0); 
    
    
    
    
    
    BOOST_CHECK_EQUAL(GetTransactionWeight(CTransaction(t)), 400000);
    BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
    
    t.vout[0].scriptPubKey = CScript() << OP_RETURN << std::vector<unsigned char>(20, 0); 
    BOOST_CHECK_EQUAL(GetTransactionWeight(CTransaction(t)), 400004);
    reason.clear();
    BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
    BOOST_CHECK_EQUAL(reason, "tx-size");
    
    fIsBareMultisigStd = true;
    t.vout[0].scriptPubKey = GetScriptForMultisig(1, {key.GetPubKey()}); 
    t.vin.resize(1);
    t.vin[0].scriptSig = CScript() << std::vector<unsigned char>(65, 0);
    BOOST_CHECK(IsStandardTx(CTransaction(t), reason));
    fIsBareMultisigStd = false;
    reason.clear();
    BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
    BOOST_CHECK_EQUAL(reason, "bare-multisig");
    fIsBareMultisigStd = DEFAULT_PERMIT_BAREMULTISIG;
}
BOOST_AUTO_TEST_SUITE_END()