pack-objects: prepare `write_reused_pack_verbatim()` for multi-pack reuse

pack-objects: prepare `write_reused_pack_verbatim()` for multi-pack reuse

The function `write_reused_pack_verbatim()` within
`builtin/pack-objects.c` is responsible for writing out a continuous
set of objects beginning at the start of the reuse packfile.

In the existing implementation, we did something like:

    while (pos < reuse_packfile_bitmap->word_alloc &&
           reuse_packfile_bitmap->words[pos] == (eword_t)~0)
      pos++;

    if (pos)
      /* write first `pos * BITS_IN_WORD` objects from pack */

as an optimization to record a single chunk for the longest continuous
prefix of objects wanted out of the reuse pack, instead of having a
chunk for each individual object. For more details, see bb514de356
(pack-objects: improve partial packfile reuse, 2019-12-18).

In order to retain this optimization in a multi-pack reuse world, we can
no longer assume that the first object in a pack is on a word boundary
in the bitmap storing the set of reusable objects.

Assuming that all objects from the beginning of the reuse packfile up to
the object corresponding to the first bit on a word boundary are part of
the result, consume whole words at a time until the last whole word
belonging to the reuse packfile. Copy those objects to the resulting
packfile, and track that we reused them by recording a single chunk.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>