pgstat: move pgstat_report_autovac() to pgstat_database.c.

I got the location wrong in 1361959. The name did make it sound like it
belonged in pgstat_relation.c...

Author: anarazel

src/backend/utils/activity/pgstat_database.c

@@ -54,6 +54,26 @@ pgstat_drop_database(Oid databaseid)
 	pgstat_send(&msg, sizeof(msg));
 }
 
+/*
+ * Called from autovacuum.c to report startup of an autovacuum process.
+ * We are called before InitPostgres is done, so can't rely on MyDatabaseId;
+ * the db OID must be passed in, instead.
+ */
+void
+pgstat_report_autovac(Oid dboid)
+{
+	PgStat_MsgAutovacStart msg;
+
+	if (pgStatSock == PGINVALID_SOCKET)
+		return;
+
+	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
+	msg.m_databaseid = dboid;
+	msg.m_start_time = GetCurrentTimestamp();
+
+	pgstat_send(&msg, sizeof(msg));
+}
+
 /*
  * Tell the collector about a Hot Standby recovery conflict.
  */

src/backend/utils/activity/pgstat_relation.c

@@ -167,26 +167,6 @@ pgstat_drop_relation(Oid relid)
 }
 #endif							/* NOT_USED */
 
-/*
- * Called from autovacuum.c to report startup of an autovacuum process.
- * We are called before InitPostgres is done, so can't rely on MyDatabaseId;
- * the db OID must be passed in, instead.
- */
-void
-pgstat_report_autovac(Oid dboid)
-{
-	PgStat_MsgAutovacStart msg;
-
-	if (pgStatSock == PGINVALID_SOCKET)
-		return;
-
-	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_AUTOVAC_START);
-	msg.m_databaseid = dboid;
-	msg.m_start_time = GetCurrentTimestamp();
-
-	pgstat_send(&msg, sizeof(msg));
-}
-
 /*
  * Tell the collector about the table we just vacuumed.
  */

src/include/pgstat.h

@@ -1025,6 +1025,7 @@ extern void pgstat_send_checkpointer(void);
  */
 
 extern void pgstat_drop_database(Oid databaseid);
+extern void pgstat_report_autovac(Oid dboid);
 extern void pgstat_report_recovery_conflict(int reason);
 extern void pgstat_report_deadlock(void);
 extern void pgstat_report_checksum_failures_in_db(Oid dboid, int failurecount);
@@ -1060,7 +1061,6 @@ extern PgStat_BackendFunctionEntry *find_funcstat_entry(Oid func_id);
 
 extern void pgstat_relation_init(Relation rel);
 
-extern void pgstat_report_autovac(Oid dboid);
 extern void pgstat_report_vacuum(Oid tableoid, bool shared,
 								 PgStat_Counter livetuples, PgStat_Counter deadtuples);
 extern void pgstat_report_analyze(Relation rel,