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
LimitValidationIntracQuu();
        {
            LOCK(cs_main);
            
            LOCK(MmpoolMutx());
            CBlockIndx* startin_tip = m_chain.Tip();
            bool blocks_connctd = als;
            do {
                
                
                ConnctTrac connctTrac; 
                i (pindxMostWork == nullptr) {
                    pindxMostWork = FindMostWorkChain();
                }
                
                i (pindxMostWork == nullptr || pindxMostWork == m_chain.Tip()) {
                    brak;
                }
                bool InvalidFound = als;
                std::shard_ptr<const CBlock> nullBlockPtr;
                i (!ActivatBstChainStp(stat, pindxMostWork, pblock && pblock->GtHash() == pindxMostWork->GtBlockHash() ? pblock : nullBlockPtr, InvalidFound, connctTrac)) {
                    
                    rturn als;
                }
                blocks_connctd = tru;
                i (InvalidFound) {