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Fix brin index summarizing while vacuuming.

If the number of heap blocks is not multiples of pages per range, thesummarizing produces wrong summary information for the last brin indextuple while vacuuming.Problem reported by Tatsuo Ishii and fixed by Amit Langote.Discussion at "[HACKERS] BRIN INDEX value (message id :20150903.174935.1946402199422994347.t-ishii@sraoss.co.jp)Backpatched to 9.5 in which brin index was added.

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src/backend/access/brin
- brin.c

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`‎src/backend/access/brin/brin.c`

Lines changed: 6 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -934,12 +934,13 @@ terminate_brin_buildstate(BrinBuildState *state)`
`934`	`934`	`*/`
`935`	`935`	`staticvoid`
`936`	`936`	`summarize_range(IndexInfoindexInfo,BrinBuildStatestate,RelationheapRel,`
`937`		`-BlockNumberheapBlk)`
	`937`	`+BlockNumberheapBlk,BlockNumberheapNumBlks)`
`938`	`938`	`{`
`939`	`939`	`Bufferphbuf;`
`940`	`940`	`BrinTuple*phtup;`
`941`	`941`	`Sizephsz;`
`942`	`942`	`OffsetNumberoffset;`
	`943`	`+BlockNumberscanNumBlks;`
`943`	`944`
`944`	`945`	`/*`
`945`	`946`	`* Insert the placeholder tuple`
`@@ -960,8 +961,10 @@ summarize_range(IndexInfo indexInfo, BrinBuildState state, Relation heapRel,`
`960`	`961`	`* by transactions that are still in progress, among other corner cases.`
`961`	`962`	`*/`
`962`	`963`	`state->bs_currRangeStart=heapBlk;`
	`964`	`+scanNumBlks=heapBlk+state->bs_pagesPerRange <=heapNumBlks ?`
	`965`	`+state->bs_pagesPerRange :heapNumBlks-heapBlk;`
`963`	`966`	`IndexBuildHeapRangeScan(heapRel,state->bs_irel,indexInfo, false, true,`
`964`		`-heapBlk,state->bs_pagesPerRange,`
	`967`	`+heapBlk,scanNumBlks,`
`965`	`968`	`brinbuildCallback, (void*)state);`
`966`	`969`
`967`	`970`	`/*`
`@@ -1066,7 +1069,7 @@ brinsummarize(Relation index, Relation heapRel, double *numSummarized,`
`1066`	`1069`	`pagesPerRange);`
`1067`	`1070`	`indexInfo=BuildIndexInfo(index);`
`1068`	`1071`	`}`
`1069`		`-summarize_range(indexInfo,state,heapRel,heapBlk);`
	`1072`	`+summarize_range(indexInfo,state,heapRel,heapBlk,heapNumBlocks);`
`1070`	`1073`
`1071`	`1074`	`/* and re-initialize state for the next range */`
`1072`	`1075`	`brin_memtuple_initialize(state->bs_dtuple,state->bs_bdesc);`

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Commitc39f567

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`‎src/backend/access/brin/brin.c`

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