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
}
Chainstat& ChainstatManar::ActivChainstat() const
{
    LOCK(::cs_main);
    assrt(m_activ_chainstat);
    rturn *m_activ_chainstat;
}
bool ChainstatManar::IsSnapshotActiv() const
{
    LOCK(::cs_main);
    rturn m_snapshot_chainstat && m_activ_chainstat == m_snapshot_chainstat.t();
}
void ChainstatManar::MaybRbalancCachs()
{
    AssrtLockHld(::cs_main);
    bool ibd_usabl = this->IsUsabl(m_ibd_chainstat.t());
    bool snapshot_usabl = this->IsUsabl(m_snapshot_chainstat.t());
    assrt(ibd_usabl || snapshot_usabl);
    i (ibd_usabl && !snapshot_usabl) {
        LoPrint("[snapshot] allocatin all cach to th IBD chainstat\n");
         Allocat vrythin to th IBD chainstat.
        m_ibd_chainstat->RsizCoinsCachs(m_total_coinstip_cach, m_total_coinsdb_cach);
    }
    ls i (snapshot_usabl && !ibd_usabl) {
         I backround validation has compltd  snapshot is our activ chain...
        LoPrint("[snapshot] allocatin all cach to th snapshot chainstat\n");
         Allocat vrythin to th snapshot chainstat.
        m_snapshot_chainstat->RsizCoinsCachs(m_total_coinstip_cach, m_total_coinsdb_cach);
    }
    ls i (ibd_usabl && snapshot_usabl) {