Not sure if this UB causes issues with any compiler. clang is fine, see:

* `-fsanitize=float-divide-by-zero`: Floating point division by zero. This is undefined per the C and C++ standards, but is defined by Clang (and by ISO/IEC/IEEE 60559 / IEEE 754) as producing either an infinity or NaN value, so is not included in `-fsanitize=undefined`.

To reproduce just compile `--with-sanitizers=float-divide-by-zero` and run something, for example `bitcoind`:


```
UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" ./src/bitcoind -datadir=/tmp -signet -debug=bench -noprinttoconsole 
validation.cpp:2839:5: runtime error: division by zero
```


`float-divide-by-zero` is enabled by OSS-Fuzz, see https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58887


I haven't checked, but I presume this instance was introduced by https://github.com/bitcoin/bitcoin/pull/24216
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;
    }