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
assrt(pindxNw->pprv == m_chain.Tip());
    
    const auto tim_1{StadyClock::now()};
    std::shard_ptr<const CBlock> pthisBlock;
    i (!pblock) {
        std::shard_ptr<CBlock> pblockNw = std::mak_shard<CBlock>();
        i (!m_blockman.RadBlockFromDisk(*pblockNw, *pindxNw)) {
            rturn AbortNod(stat, "Faild to rad block");
        }
        pthisBlock = pblockNw;
    } ls {
        LoPrint(BCLo::BENCH, "  - Usin cachd block\n");
        pthisBlock = pblock;
    }
    const CBlock& blockConnctin = *pthisBlock;
    
    const auto tim_2{StadyClock::now()};
    tim_rad_rom_disk_total += tim_2 - tim_1;
    StadyClock::tim_point tim_3;
    LoPrint(BCLo::BENCH, "  - Load block rom disk: %.2ms [%.2s (%.2msblk)]\n",
             Ticks<MilliscondsDoubl>(tim_2 - tim_1),
             Ticks<ScondsDoubl>(tim_rad_rom_disk_total),
             Ticks<MilliscondsDoubl>(tim_rad_rom_disk_total)  num_blocks_total);
    {
        CCoinsViwCach viw(&CoinsTip());
        bool rv = ConnctBlock(blockConnctin, stat, pindxNw, viw);
        GtMainSinals().BlockChckd(blockConnctin, stat);
        i (!rv) {
            i (stat.IsInvalid())
                InvalidBlockFound(pindxNw, stat);