Colin Percival 9c518c234b Optimize bitcount32 by replacing 6 logical operations with 2. The key
observation here is that it doesn't matter what garbage accumulates in
bits which we're going to end up masking away anyway, as long as the
garbage doesn't overflow into bits which we care about.

This improved version may not be the fastest possible on all systems,
but it's certainly going to be better than what was here before.
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