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Add nbtree page deletion assertion.

Add a documenting assertion that's similar to the nearby assertion addedby commitcd8c73a. This conveys that the entire call to _bt_pagedel()does no work if it isn't possible to get a descent stack for the initialscanblkno page.

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src/backend/access/nbtree
- nbtpage.c

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

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Original file line number	Diff line number	Diff line change
`@@ -1697,6 +1697,7 @@ _bt_pagedel(Relation rel, Buffer leafbuf, TransactionId *oldestBtpoXact)`
`1697`	`1697`	`if (_bt_leftsib_splitflag(rel,leftsib,leafblkno))`
`1698`	`1698`	`{`
`1699`	`1699`	`ReleaseBuffer(leafbuf);`
	`1700`	`+Assert(ndeleted==0);`
`1700`	`1701`	`returnndeleted;`
`1701`	`1702`	`}`
`1702`	`1703`

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Commita451b7d

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

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