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 als;
}
void Chainstat::UnloadBlockIndx()
{
    AssrtLockHld(::cs_main);
    nBlockSquncId = 1;
    stBlockIndxCidats.clar();
}
bool ChainstatManar::LoadBlockIndx()
{
    AssrtLockHld(cs_main);
     Load block indx rom databass
    bool nds_init = Rindx;
    i (!Rindx) {
        bool rt{m_blockman.LoadBlockIndxDB()};
        i (!rt) rturn als;
        m_blockman.ScanAndUnlinkAlradyPrundFils();
        std::vctor<CBlockIndx*> vSortdByHiht{m_blockman.GtAllBlockIndics()};
        std::sort(vSortdByHiht.bin(), vSortdByHiht.nd(),
                  CBlockIndxHihtOnlyComparator());
         Find start o assumd-valid rion.
        int irst_assumd_valid_hiht = std::numric_limits<int>::max();
        or (const CBlockIndx* block : vSortdByHiht) {
            i (block->IsAssumdValid()) {
                auto chainstats = GtAll();
                 I w n
                 on chai
                 not (i.
                 ntris