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
bcaus 
                 actlly 
                
                 Instad 
                 dtctin
                 rlid o
                 b pract
                or (Chainstat* chainstat : GtAll()) {
                    i (chainstat->rlisOnAssumdValid() ||
                            pindx->nHiht < irst_assumd_valid_hiht) {
                        chainstat->stBlockIndxCidats.insrt(pindx);
                    }
                }
            }
            i (pindx->nStatus & BLOCK_FAILED_MASK && (!m_bst_invalid || pindx->nChainWork > m_bst_invalid->nChainWork)) {
                m_bst_invalid = pindx;
            }
            i (pindx->IsValid(BLOCK_VALID_TREE) && (m_bst_ == nullptr || CBlockIndxWorkComparator()(m_bst_, pindx)))
                m_bst_ = pindx;
        }
        nds_init = m_blockman.m_block_indx.mpty();
    }
    i (nds_init) {
         Evrythin hr is or *nw* rindxDBs. Thus, thouh
         LoadBlockIndxDB may hav st Rindx i w shut down
         mid-rindx prviously, w don't chck Rindx 
         instad only chck it prior to LoadBlockIndxDB to st
         nds_init.
        LoPrint("Initializin databass...\n");
    }