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由 Ashwin Agrawal 提交于
`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)
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