`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++`
for (int i{0}; i < 1000; ++i) {
            COutPoint res = add_coin(view);
            BOOST_CHECK_EQUAL(view.AccessCoin(res).DynamicMemoryUsage(), COIN_SIZE);
        }
        BOOST_CHECK_EQUAL(
            chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES,  0),
            CoinsCacheSizeState::CRITICAL);
        BOOST_TEST_MESSAGE("Exiting cache flush tests early due to unsupported arch");
        return;
    }
    print_view_mem_usage(view);
    BOOST_CHECK_EQUAL(view.DynamicMemoryUsage(), is_64_bit ? 32 : 16);
    
    
    
    
    
    
    
    
    
    constexpr int COINS_UNTIL_CRITICAL = is_64_bit ? 4 : 5;
    for (int i{0}; i < COINS_UNTIL_CRITICAL; ++i) {
        COutPoint res = add_coin(view);
        print_view_mem_usage(view);
        BOOST_CHECK_EQUAL(view.AccessCoin(res).DynamicMemoryUsage(), COIN_SIZE);
        BOOST_CHECK_EQUAL(
            chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES,  0),
            CoinsCacheSizeState::OK);