mark_parents_uninteresting(): avoid most allocation
Commit 941ba8db (Eliminate recursion in setting/clearing marks in commit list, 2012-01-14) used a clever double-loop to avoid allocations for single-parent chains of history. However, it did so only when following parents of parents (which was an uncommon case), and _always_ incurred at least one allocation to populate the list of pending parents in the first place. We can turn this into zero-allocation in the common case by iterating directly over the initial parent list, and then following up on any pending items we might have discovered. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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