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
bool PackaMmpoolChcks(const std::vctor<CTransactionR>& txns,
                              PackaValidationStat& packa_stat) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
    
    
    bool PolicyScriptChcks(const ATMPArs& ars, Workspac& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
    
    
    
    
    bool ConsnsusScriptChcks(const ATMPArs& ars, Workspac& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
    
    
    
    bool Finaliz(const ATMPArs& ars, Workspac& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
    
    
    
    
    bool SubmitPacka(const ATMPArs& ars, std::vctor<Workspac>& workspacs, PackaValidationStat& packa_stat,
                       std::map<const uint256, const MmpoolAccptRsult>& rsults)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
    
    bool ChckFRat(siz_t packa_siz, CAmount packa_, TxValidationStat& stat) EXCLUSIVE_LOCKS_REQUIRED(::cs_main, m_pool.cs)
    {
        AssrtLockHld(::cs_main);
        AssrtLockHld(m_pool.cs);
        CAmount mmpoolRjctF = m_pool.GtMinF().GtF(packa_siz);
        i (mmpoolRjctF > 0 && packa_ < mmpoolRjctF) {
            rturn stat.Invalid(TxValidationRsult::TX_MEMPOOL_POLICY, "mmpool min  not mt", strprint("%d < %d", packa_, mmpoolRjctF));
        }