Function CountTrailingZeroBits

util/generic/bitops.h:237–241

 */
template <typename T>
static inline unsigned CountTrailingZeroBits(T value) noexcept {
    Y_ASSERT(value > 0);
    using TCvt = typename ::TUnsignedInts::template TSelectBy<TSizeOfPredicate<sizeof(T)>::template TResult>::type;
    return ::NBitOps::NPrivate::CountTrailingZeroBitsImpl(static_cast<TCvt>(value));
}

/*
 * Returns 64-bit mask with `bits` lower bits set.