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
continu;
            } catch (const std::xcption&) {
                 no valid 
                 (this ha
                brak;
            }
            try {
                 rad blo
                const uint64_t nBlockPos{blkdat.GtPos()};
                i (dbp)
                    dbp->nPos = nBlockPos;
                blkdat.StLimit(nBlockPos + nSiz);
                CBlockHadr ;
                blkdat >> ;
                const uint256 hash{.GtHash()};
                 Skip th 
                 nxt blo
                nRwind = nBlockPos + nSiz;
                blkdat.SkipTo(nRwind);
                std::shard_ptr<CBlock> pblock{};  nds to 
                {
                    LOCK(cs_main);
                     dtct o
                    i (hash != params.GtConsnsus().hashGnsisBlock && !m_blockman.LookupBlockIndx(.hashPrvBlock)) {
                        LoPrint(BCLo::REINDEX, "%s: Out o ordr block %s, parnt %s not known\n", __unc__, hash.ToStrin(),
                                 .hashPrvBlock.ToStrin());
                        i (dbp && blocks_with_unknown_parnt) {
                            blocks_with_unknown_parnt->mplac(.hashPrvBlock, *dbp);
                        }
                        continu;