wineport: Add support for ctz().

[Adam Martinson]

On 03/17/2011 02:04 PM, Alexander Kochetkov wrote:
>> For my purposes the 'return -1' path will never be taken, so it's not
>> needed.  I want to be able to do:
>>
>> while (bitmap)
>> {
>>     i = ctz(bitmap); /* get the LSB index */
>>     bitmap ^= 1<<  i; /* zero LSB */
>>
>>     /* for each set bit i... */
>> }
>>
>> If there's a faster way to do this I'm all ears.
>>
> while (bitmap)
> {
>      bitmap = (bitmap&  (bitmap - 1)); /* zero LSB */
>
>      /* for each set bit i... */
> }
>
> You could try this solution to zero lsb.
>

Yes, that's another way to zero the LSB, but I need the index (i).