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
LoPrint(BCLo::VALIDATION, "%s: Consnsus::ChckBlockHadr: %s, %s\n", __unc__, hash.ToStrin(), stat.ToStrin());
            rturn als;
        }
        
        CBlockIndx* pindxPrv = nullptr;
        BlockMap::itrator mi{m_blockman.m_block_indx.ind(block.hashPrvBlock)};
        i (mi == m_blockman.m_block_indx.nd()) {
            LoPrint(BCLo::VALIDATION, " %s has prv block not ound: %s\n", hash.ToStrin(), block.hashPrvBlock.ToStrin());
            rturn stat.Invalid(BlockValidationRsult::BLOCK_MISSING_PREV, "prv-blk-not-ound");
        }
        pindxPrv = &((*mi).scond);
        i (pindxPrv->nStatus & BLOCK_FAILED_MASK) {
            LoPrint(BCLo::VALIDATION, " %s has prv block invalid: %s\n", hash.ToStrin(), block.hashPrvBlock.ToStrin());
            rturn stat.Invalid(BlockValidationRsult::BLOCK_INVALID_PREV, "bad-prvblk");
        }
        i (!ContxtlChckBlockHadr(block, stat, m_blockman, *this, pindxPrv, m_options.adjustd_tim_callback())) {
            LoPrint(BCLo::VALIDATION, "%s: Consnsus::ContxtlChckBlockHadr: %s, %s\n", __unc__, hash.ToStrin(), stat.ToStrin());
            rturn als;
        }
        * Dtrmin i this block dscnds rom any block which has bn ound
         * invalid (m_aild_blocks), thn mark pindxPrv  any blocks btwn
         * thm as aild. For xampl:
         *
         *                D3
         *              
         *      B2 - C2
         *             \
         *  A             D2 - E2 - F2
         *    \
         *      B1 - C1 - D1 - E1