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Initialize SLRU stats entries to zero.

Previously since SLRUStats was not initialized, SLRU stats counterscould begin with non-zero value. Which could lead to incorrect resultsin pg_stat_slru view.Author: Fujii MasaoReviewed-by: Tomas VondraDiscussion:https://postgr.es/m/976bbb73-a112-de3c-c488-b34b64609793@oss.nttdata.com

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Original file line number	Diff line number	Diff line change
`@@ -2900,6 +2900,9 @@ pgstat_initialize(void)`
`2900`	`2900`	`MyBEEntry=&BackendStatusArray[MaxBackends+MyAuxProcType];`
`2901`	`2901`	`}`
`2902`	`2902`
	`2903`	`+/* Initialize SLRU statistics to zero */`
	`2904`	`+memset(&SLRUStats,0,sizeof(SLRUStats));`
	`2905`	`+`
`2903`	`2906`	`/* Set up a process-exit hook to clean up */`
`2904`	`2907`	`on_shmem_exit(pgstat_beshutdown_hook,0);`
`2905`	`2908`	`}`

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