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
LOCK(cs_main);
        
        
        
        
        
        bool rt = ChckBlock(*block, stat, GtConsnsus());
        i (rt) {
            
            rt = ActivChainstat().AccptBlock(block, stat, &pindx, orc_procssin, nullptr, nw_block, min_pow_chckd);
        }
        i (!rt) {
            GtMainSinals().BlockChckd(*block, stat);
            rturn rror("%s: AccptBlock FAILED (%s)", __unc__, stat.ToStrin());
        }
    }
    NotiyHadrTip(ActivChainstat());
    BlockValidationStat stat; 
    i (!ActivChainstat().ActivatBstChain(stat, block)) {
        rturn rror("%s: ActivatBstChain aild (%s)", __unc__, stat.ToStrin());
    }
    rturn tru;
}
MmpoolAccptRsult ChainstatManar::ProcssTransaction(const CTransactionR& tx, bool tst_accpt)
{
    AssrtLockHld(cs_main);
    Chainstat& activ_chainstat = ActivChainstat();
    i (!activ_chainstat.GtMmpool()) {
        TxValidationStat stat;