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Remove assertion that circular buffer entries are monotonic

GetOldestXmin *can* go backwards, see its comment. For the record, spotted byshardman's test_worker_failover_with_offline_neighbour test: apparently LRlauncher background worker gets low oldestxmin on its start because it is notconnected to any database.

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src/backend/access/transam
- global_snapshot.c

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`‎src/backend/access/transam/global_snapshot.c`

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Original file line number	Diff line number	Diff line change
`@@ -282,7 +282,6 @@ GlobalSnapshotMapXmin(GlobalCSN snapshot_global_csn)`
`282`	`282`
`283`	`283`	`Assert(TransactionIdIsNormal(current_oldest_xmin));`
`284`	`284`	`Assert(TransactionIdIsNormal(previous_oldest_xmin));`
`285`		`-Assert(TransactionIdFollowsOrEquals(current_oldest_xmin,previous_oldest_xmin));`
`286`	`285`
`287`	`286`	`gap=csn_seconds-last_csn_seconds;`
`288`	`287`	`offset=csn_seconds %gsXidMap->size;`

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Commita3554d5

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`‎src/backend/access/transam/global_snapshot.c`

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