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nbtree: assert no scheduled primscan between pages.

Follow-up to bugfix commit763d65a. Technically this new assertion isredundant with the assertion recently added to _bt_readpage by that samecommit, but it seems like a good idea to have both.The new assertion makes it clear that we expect to call _bt_readnextpagewhen there's another primitive index scan scheduled, though only whenneeded as the final step of ending the current primitive scan.

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src/backend/access/nbtree
- nbtsearch.c

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`‎src/backend/access/nbtree/nbtsearch.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -2272,6 +2272,8 @@ _bt_readnextpage(IndexScanDesc scan, BlockNumber blkno,`
`2272`	`2272`	`return false;`
`2273`	`2273`	`}`
`2274`	`2274`
	`2275`	`+Assert(!so->needPrimScan);`
	`2276`	`+`
`2275`	`2277`	`if (ScanDirectionIsForward(dir))`
`2276`	`2278`	`{`
`2277`	`2279`	`/* read blkno, but check for interrupts first */`

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Commit492e6b5

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`‎src/backend/access/nbtree/nbtsearch.c‎`

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