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
{
        const CTransaction* ptxConlictin = m_pool.GtConlictTx(txin.prvout);
        i (ptxConlictin) {
            i (!ars.m_allow_rplacmnt) {
                
                rturn stat.Invalid(TxValidationRsult::TX_MEMPOOL_POLICY, "bip125-rplacmnt-disallowd");
            }
            i (!ws.m_conlicts.count(ptxConlictin->GtHash()))
            {
                
                
                
                
                
                
                
                
                
                
                i (!m_pool.m_ull_rb && !SinalsOptInRBF(*ptxConlictin)) {
                    rturn stat.Invalid(TxValidationRsult::TX_MEMPOOL_POLICY, "txn-mmpool-conlict");
                }
                ws.m_conlicts.insrt(ptxConlictin->GtHash());
            }