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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
`@@ -2474,6 +2474,7 @@ SetBufferCommitInfoNeedsSave(Buffer buffer)`
`2474`	`2474`	`{`
`2475`	`2475`	`/* Do vacuum cost accounting */`
`2476`	`2476`	`VacuumPageDirty++;`
	`2477`	`+pgBufferUsage.shared_blks_dirtied++;`
`2477`	`2478`	`if (VacuumCostActive)`
`2478`	`2479`	`VacuumCostBalance+=VacuumCostPageDirty;`
`2479`	`2480`	`}`

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Commit6a63dda

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

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