Prevent intermittent hang in recovery from bgwriter interaction.

Startup process waited for cleanup lock but when hot_standby = off
the pid was not registered, so that the bgwriter would not wake
the waiting process as intended.

Author: simonat2ndQuadrant

src/backend/access/transam/xlog.c

@@ -49,6 +49,7 @@
 #include "storage/latch.h"
 #include "storage/pmsignal.h"
 #include "storage/predicate.h"
+#include "storage/proc.h"
 #include "storage/procarray.h"
 #include "storage/reinit.h"
 #include "storage/smgr.h"
@@ -6406,6 +6407,7 @@ StartupXLOG(void)
 		 */
 		if (InArchiveRecovery && IsUnderPostmaster)
 		{
+			PublishStartupProcessInformation();
 			SetForwardFsyncRequests();
 			SendPostmasterSignal(PMSIGNAL_RECOVERY_STARTED);
 			bgwriterLaunched = true;

src/backend/storage/ipc/standby.c

@@ -68,11 +68,6 @@ InitRecoveryTransactionEnvironment(void)
 	 */
 	SharedInvalBackendInit(true);
 
-	/*
-	 * Record the PID and PGPROC structure of the startup process.
-	 */
-	PublishStartupProcessInformation();
-
 	/*
 	 * Lock a virtual transaction id for Startup process.
 	 *