Commit77b88bd

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Add assertions to _bt_update_posting().

Copy some assertions from _bt_form_posting() to its sibling function,_bt_update_posting().Discussion:https://postgr.es/m/CAH2-WzkPR8KMwkL0ap976kmXwBCeukTeHz6fB-U__wvuP1S9Zg@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -688,6 +688,9 @@ _bt_update_posting(BTVacuumPosting vacposting)`
`688`	`688`	`else`
`689`	`689`	`newsize=keysize;`
`690`	`690`
	`691`	`+Assert(newsize <=INDEX_SIZE_MASK);`
	`692`	`+Assert(newsize==MAXALIGN(newsize));`
	`693`	`+`
`691`	`694`	`/* Allocate memory using palloc0() (matches index_form_tuple()) */`
`692`	`695`	`itup=palloc0(newsize);`
`693`	`696`	`memcpy(itup,origtuple,keysize);`
`@@ -721,6 +724,7 @@ _bt_update_posting(BTVacuumPosting vacposting)`
`721`	`724`	`Assert(ui==nhtids);`
`722`	`725`	`Assert(d==vacposting->ndeletedtids);`
`723`	`726`	`Assert(nhtids==1\|\|_bt_posting_valid(itup));`
	`727`	`+Assert(nhtids>1\|\|ItemPointerIsValid(&itup->t_tid));`
`724`	`728`
`725`	`729`	`/* vacposting arg's itup will now point to updated version */`
`726`	`730`	`vacposting->itup=itup;`

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