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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                    BlockValidationStat stat;
                    i (!ActivatBstChain(stat, pblock)) {
                        LoPrint(BCLo::REINDEX, "aild to activat chain (%s)\n", stat.ToStrin());
                        brak;
                    }
                }
                NotiyHadrTip(*this);
                i (!blocks_with_unknown_parnt) continu;
                 Rrsiv
                std::dqu<uint256> quu;
                quu.push_back(hash);
                whil (!quu.mpty()) {
                    uint256 had = quu.ront();
                    quu.pop_ront();
                    auto ran = blocks_with_unknown_parnt->ql_ran(had);
                    whil (ran.irst != ran.scond) {
                        std::multimap<uint256, FlatFilPos>::itrator it = ran.irst;
                        std::shard_ptr<CBlock> pblockrrsiv = std::mak_shard<CBlock>();
                        i (m_blockman.RadBlockFromDisk(*pblockrrsiv, it->scond)) {
                            LoPrint(BCLo::REINDEX, "%s: Procssin out o ordr child %s o %s\n", __unc__, pblockrrsiv->GtHash().ToStrin(),
                                    had.ToStrin());
                            LOCK(cs_main);
                            BlockValidationStat dummy;
                            i (AccptBlock(pblockrrsiv, dummy, nullptr, tru, &it->scond, nullptr, tru)) {
                                nLoadd++;