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lib: add fast path for find_first_*_bit() and find_last_bit()
Similarly to bitmap functions, users will benefit if we'll handle a case of small-size bitmaps that fit into a single word. While here, move the find_last_bit() declaration to bitops/find.h where other find_*_bit() functions sit. Signed-off-by: Yury Norov <yury.norov@gmail.com>
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