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Assert that pre/post-fix updated tuples are on the same page during replay.

If they were not 'oldtup.t_data' would be dereferenced while set to NULLin case of a full page image for block 0.Do so primarily to silence coverity; but also to make sure this prerequisiteisn't changed without adapting the replay routine as that would appear towork in many cases.Andres Freund

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src/backend/access/heap
- heapam.c

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`‎src/backend/access/heap/heapam.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -8115,11 +8115,13 @@ newsame:;`
`8115`	`8115`
`8116`	`8116`	`if (xlrec->flags&XLOG_HEAP_PREFIX_FROM_OLD)`
`8117`	`8117`	`{`
	`8118`	`+Assert(samepage);`
`8118`	`8119`	`memcpy(&prefixlen,recdata,sizeof(uint16));`
`8119`	`8120`	`recdata+=sizeof(uint16);`
`8120`	`8121`	`}`
`8121`	`8122`	`if (xlrec->flags&XLOG_HEAP_SUFFIX_FROM_OLD)`
`8122`	`8123`	`{`
	`8124`	`+Assert(samepage);`
`8123`	`8125`	`memcpy(&suffixlen,recdata,sizeof(uint16));`
`8124`	`8126`	`recdata+=sizeof(uint16);`
`8125`	`8127`	`}`

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Commit1460b19

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`‎src/backend/access/heap/heapam.c‎`

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