Commitd7fe02f

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Fixup for prefetching support on macOS

The new code path (commit6654bb9) should call FileAccess() first,like the posix_fadvise() path.Reported-by: Thomas Munro <thomas.munro@gmail.com>Discussion:https://www.postgresql.org/message-id/flat/0827edec-1317-4917-a186-035eb1e3241d%40eisentraut.org

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Original file line number	Diff line number	Diff line change
`@@ -2110,6 +2110,10 @@ FilePrefetch(File file, off_t offset, off_t amount, uint32 wait_event_info)`
`2110`	`2110`	`}ra;`
`2111`	`2111`	`intreturnCode;`
`2112`	`2112`
	`2113`	`+returnCode=FileAccess(file);`
	`2114`	`+if (returnCode<0)`
	`2115`	`+returnreturnCode;`
	`2116`	`+`
`2113`	`2117`	`ra.ra_offset=offset;`
`2114`	`2118`	`ra.ra_count=amount;`
`2115`	`2119`	`pgstat_report_wait_start(wait_event_info);`

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