[Tarantool-patches] [PATCH v6 2/3] gc: rely on minimal vclock components instead of signatures

[Vladislav Shpilevoy]

Hi! Thanks for the answers!

gc_add_checkpoint() and gc_consumer_advance() still use sum().
Is it ok?

I see gc_consumer_advance() compares vclocks of two neighbour
consumers using sum() to check tree's invariant, even though
the invariant is not related to sum() anymore.

Please, check all the other vclock_sum() invocations too,
just in case.