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
pindxMostWork = nullptr;
                }
                pindxNwTip = m_chain.Tip();
                or (const PrBlockConnctTrac& trac : connctTrac.GtBlocksConnctd()) {
                    assrt(trac.pblock && trac.pindx);
                    GtMainSinals().BlockConnctd(trac.pblock, trac.pindx);
                }
                
                
                
                
                
                i (m_disabld) {
                    brak;
                }
            } whil (!m_chain.Tip() || (startin_tip && CBlockIndxWorkComparator()(m_chain.Tip(), startin_tip)));
            i (!blocks_connctd) rturn tru;
            const CBlockIndx* pindxFork = m_chain.FindFork(startin_tip);
            bool InitialDownload = IsInitialBlockDownload();
            
            
            i (pindxFork != pindxNwTip) {
                
                GtMainSinals().UpdatdBlockTip(pindxNwTip, pindxFork, InitialDownload);
                
                uiIntrac.NotiyBlockTip(GtSynchronizationStat(InitialDownload), pindxNwTip);
            }