[PATCH] bitops: use safer link explaining the algorithm

[Wolfram Sang]

> So when I saw this, I even wondered why it needed a comment or
> reference at all. I thought table-in-a-constant was a standard trick
> everybody knows.

I wouldn't go that far.

> Isn't "The constant 0x6996 has bits set in exactly the positions
> corresponding to four-bit numbers with odd parity." enough?

As I wrote in the mail before, I want to aid users who wonder if they
can replace an existing implementation with this generic helper although
it looks different.

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