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There's no easy way to make a copy of a bitmap. Obviously a caller can iterate over the bits and set them one by one in a new bitmap, but we can go much faster by copying whole words with memcpy(). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>