pack-bitmap-write.c: write pseudo-merge table

Now that the pack-bitmap writer machinery understands how to select and
store pseudo-merge commits, teach it how to write the new optional
pseudo-merge .bitmap extension.

No readers yet exist for this new extension to the .bitmap format. The
following commits will take any preparatory step(s) necessary before
then implementing the routines necessary to read this new table.

In the meantime, the new `write_pseudo_merges()` function implements
writing this new format as described by a previous commit in
Documentation/technical/bitmap-format.txt.

Writing this table is fairly straightforward and consists of a few
sub-components:

  - a pair of bitmaps for each pseudo-merge (one for the pseudo-merge
    "parents", and another for the objects reachable from those parents)

  - for each commit, the offset of either (a) the pseudo-merge it
    belongs to, or (b) an extended lookup table if it belongs to >1
    pseudo-merge groups

  - if there are any commits belonging to >1 pseudo-merge group, the
    extended lookup tables (which each consist of the number of
    pseudo-merge groups a commit appears in, and then that many 4-byte
    unsigned )

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

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