**Describe the bug**
https://clickhouse-test-reports.s3.yandex.net/19702/c74631c650b42e4d107254a03bd82c2c2913039b/fuzzer_msan/server.log

Most likely introduced here: #11006
{
    uint16_t mask = _mm_movemask_epi8(_mm_cmpeq_epi8(
        _mm_loadu_si128(reinterpret_cast<const __m128i *>(a)),
        _mm_loadu_si128(reinterpret_cast<const __m128i *>(b))));
    mask = ~mask;
    if (mask)
    {
        auto offset = __builtin_ctz(mask);
        return detail::cmp(a[offset], b[offset]);
    }
    return 0;
}
/** Variant when the size is 16 exactly.
  */
inline bool memequal16(const void * a, const void * b)