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Count buffers dirtied due to hints in pgBufferUsage.shared_blks_dirtied.

Previously, such buffers weren't counted, with the possible result thatEXPLAIN (BUFFERS) and pg_stat_statements would understate the truenumber of blocks dirtied by an SQL statement.Back-patch to 9.2, where this counter was introduced.Amit Kapila

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src/backend/storage/buffer
- bufmgr.c

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`‎src/backend/storage/buffer/bufmgr.c`

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Original file line number	Diff line number	Diff line change
`@@ -2708,6 +2708,7 @@ MarkBufferDirtyHint(Buffer buffer, bool buffer_std)`
`2708`	`2708`	`if (dirtied)`
`2709`	`2709`	`{`
`2710`	`2710`	`VacuumPageDirty++;`
	`2711`	`+pgBufferUsage.shared_blks_dirtied++;`
`2711`	`2712`	`if (VacuumCostActive)`
`2712`	`2713`	`VacuumCostBalance+=VacuumCostPageDirty;`
`2713`	`2714`	`}`

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Commitac2063a

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`‎src/backend/storage/buffer/bufmgr.c`

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