Function GetValueBitCount

util/generic/bitops.h:227–231

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

/**
 * Returns the number of trailing 0-bits in `value`, starting at the least significant bit position