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We have a couple optimizations for when the bitset is known to be just one word. But with dynamically sized bitsets, it was actually more work to determine the size than just to do the necessary computation. Now, only use the optimization when the size is known to be constant. Reviewed by: markj Discussed with: jeff Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D22639