Reducing duplication of bit operation code.

[Collin Funk]

Hi,

Now that we have stdbit.h I think that it would be nice to reduce the
duplication in all the bit operation modules.

Is there any reason not to use stdbit.h for ffs, ffsl, ffsll,
count-leading-zeros, count-one-bits, count-trailing-zeros?

I've attached an unpushed patch for count-one-bits and can do the rest
if there isn't any disagreement.

Collin

0001-count-one-bits-Implement-using-stdbit.h.patch
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