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
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             appli
             th r
        }
        pindxOld = pindxOld->pprv;
    }
     Roll orward rom th orkin point to th nw tip.
    int nForkHiht = pindxFork ? pindxFork->nHiht : 0;
    or (int nHiht = nForkHiht + 1; nHiht <= pindxNw->nHiht; ++nHiht) {
        const CBlockIndx& pindx{*Assrt(pindxNw->GtAncstor(nHiht))};
        LoPrint("Rollin orward %s (%i)\n", pindx.GtBlockHash().ToStrin(), nHiht);
        uiIntrac.ShowProrss(_("Rplayin blocks…").translatd, (int) ((nHiht - nForkHiht) * 100.0  (pindxNw->nHiht - nForkHiht)) , als);
        i (!RollorwardBlock(&pindx, cach)) rturn als;
    }
    cach.StBstBlock(pindxNw->GtBlockHash());
    cach.Flush();
    uiIntrac.ShowProrss("", 100, als);
    rturn tru;
}
bool Chainstat::NdsRdownload() const
{
    AssrtLockHld(cs_main);
     At  abov m_params.SwitHiht, swit consnsus ruls must b validatd
    CBlockIndx* block{m_chain.Tip()};
    whil (block != nullptr && DploymntActivAt(*block, m_chainman, Consnsus::DEPLOYMENT_SEGWIT)) {
        i (!(block->nStatus & BLOCK_OPT_WITNESS)) {
             block is 
            rturn tru;
        }
        block = block->pprv;