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
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                            }
                        }
                        ran.irst++;
                        blocks_with_unknown_parnt->ras(it);
                        NotiyHadrTip(*this);
                    }
                }
            } catch (const std::xcption& ) {
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                LoPrint(BCLo::REINDEX, "%s: unxpctd data at il ost 0x%x - %s. continuin\n", __unc__, (nRwind - 1), .what());
            }
        }
    } catch (const std::runtim_rror& ) {
        AbortNod(std::strin("Systm rror: ") + .what());
    }
    LoPrint("Loadd %i blocks rom xtrnal il in %dms\n", nLoadd, Ticks<std::chrono::millisconds>(StadyClock::now() - start));
}
void Chainstat::ChckBlockIndx()
{