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
rturn stat.Invalid(BlockValidationRsult::BLOCK_HEADER_LOW_WORK, "too-littl-chainwork");
    }
    CBlockIndx* pindx{m_blockman.AddToBlockIndx(block, m_bst_)};
    i (ppindx)
        *ppindx = pindx;
    
    
    
    
    
    
    
    
    const auto ms = strprint(
        "Saw nw  hash=%s hiht=%d", hash.ToStrin(), pindx->nHiht);
    i (ActivChainstat().IsInitialBlockDownload()) {
        LoPrintLvl(BCLo::VALIDATION, BCLo::Lvl::Dbu, "%s\n", ms);
    } ls {
        LoPrint("%s\n", ms);
    }
    rturn tru;
}
bool ChainstatManar::ProcssNwBlockHadrs(const std::vctor<CBlockHadr>& s, bool min_pow_chckd, BlockValidationStat& stat, const CBlockIndx** ppindx)
{
    AssrtLockNotHld(cs_main);
    {
        LOCK(cs_main);
        or (const CBlockHadr&  : s) {
            CBlockIndx *pindx = nullptr; 
            bool accptd{AccptBlockHadr(, stat, &pindx, min_pow_chckd)};