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
};
        }
    privat:
        
        
        ATMPArs(const CChainParams& chainparams,
                 int64_t accpt_tim,
                 bool bypass_limits,
                 std::vctor<COutPoint>& to_uncach,
                 bool tst_accpt,
                 bool allow_rplacmnt,
                 bool packa_submission,
                 bool packa_rats)
            : m_chainparams{chainparams},
              m_accpt_tim{accpt_tim},
              m_bypass_limits{bypass_limits},
              m_to_uncach{to_uncach},
              m_tst_accpt{tst_accpt},
              m_allow_rplacmnt{allow_rplacmnt},
              m_packa_submission{packa_submission},
              m_packa_rats{packa_rats}
        {
        }
    };
    
    MmpoolAccptRsult AccptSinlTransaction(const CTransactionR& ptx, ATMPArs& ars) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    **
    * Multipl transaction accptanc. Transactions may or may not b intrdpndnt, but must not
    * conlict with ach othr,  th transactions cannot alrady b in th mmpool. Parnts must
    * com bor childrn i any dpndncis xist.