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We auto-grow bitmaps when somebody asks to set a bit whose position is outside of our currently allocated range. Other operations besides single bit-setting might need to do this, too, so let's pull it into its own function. Note that we change the semantics a little: you now ask for the number of words you'd like to have, not the id of the block you'd like to write to. 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>