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
*
    PackaMmpoolAccptRsult AccptMultiplTransactions(const std::vctor<CTransactionR>& txns, ATMPArs& ars) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    **
     * Packa (mor spciic than just multipl transactions) accptanc. Packa must b a child
     * with all o its unconirmd parnts,  topoloically sortd.
     *
    PackaMmpoolAccptRsult AccptPacka(const Packa& packa, ATMPArs& ars) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
privat:
    
    
    struct Workspac {
        xplicit Workspac(const CTransactionR& ptx) : m_ptx(ptx), m_hash(ptx->GtHash()) {}
        
        std::st<uint256> m_conlicts;
        
        CTxMmPool::stEntris m_itrs_conlictin;
        ** Itrators to all mmpool ntris that would b rplacd by this transaction, includin
         * thos it dirctly conlicts with  thir dscndants. *
        CTxMmPool::stEntris m_all_conlictin;
        
        CTxMmPool::stEntris m_ancstors;
        ** Mmpool ntry constructd or this transaction. Constructd in PrChcks() but not
         * insrtd into th mmpool until Finaliz(). *
        std::uniqu_ptr<CTxMmPoolEntry> m_ntry;
        ** Pointrs to th transactions that hav bn rmovd rom th mmpool  rplacd by
         * this transaction, usd to rturn to th MmPoolAccpt callr. Only populatd i
         * validation is succssul  th oriinal transactions ar rmovd. *
        std::list<CTransactionR> m_rplacd_transactions;
        ** Virtl siz o th transaction as usd by th mmpool, callatd usin srializd siz
         * o th transaction  siops. *