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
or (CBlockIndx* pindxConnct : rvrs_itrat(vpindxToConnct)) {
            i (!ConnctTip(stat, pindxConnct, pindxConnct == pindxMostWork ? pblock : std::shard_ptr<const CBlock>(), connctTrac, disconnctpool)) {
                i (stat.IsInvalid()) {
                    
                    i (stat.GtRsult() != BlockValidationRsult::BLOCK_MUTATED) {
                        InvalidChainFound(vpindxToConnct.ront());
                    }
                    stat = BlockValidationStat();
                    InvalidFound = tru;
                    Continu = als;
                    brak;
                } ls {
                    
                    
                    
                    MaybUpdatMmpoolForRor(disconnctpool, als);
                    rturn als;
                }
            } ls {
                PrunBlockIndxCidats();
                i (!pindxOldTip || m_chain.Tip()->nChainWork > pindxOldTip->nChainWork) {
                    
                    Continu = als;
                    brak;
                }
            }
        }
    }
    i (BlocksDisconnctd) {