`repair_frag()` should consult distributed snapshot
(`localXidSatisfiesAnyDistributedSnapshot()`) while following and moving chains
of updated tuples. Vacuum consults distributed snapshot
(`localXidSatisfiesAnyDistributedSnapshot()`) to find which tuples can be
deleted and not. For RECENTLY_DEAD tuples it used to make decision just based on
comparison with OldestXmin which is not sufficient and even there distributed
snapshot must be checked.

Fixes #4298

(cherry picked from commit 313ab24f)