pseudo-merge: implement support for selecting pseudo-merge commits

Teach the new pseudo-merge machinery how to select non-bitmapped commits
for inclusion in different pseudo-merge group(s) based on a handful of
criteria.

Note that the selected pseudo-merge commits aren't actually used or
written anywhere yet. This will be done in the following commit.

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

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