Add missing invocations to object access hooks

The following commands have been missing calls to object access hooks
InvokeObjectPost{Create|Alter}Hook normally applied to all commands:
- ALTER RULE RENAME TO
- ALTER USER MAPPING
- CREATE ACCESS METHOD
- CREATE STATISTICS

Thanks also to Robert Haas for the discussion.

Author: Mark Dilger
Reviewed-by: Álvaro Herrera, Michael Paquier
Discussion: https://postgr.es/m/435CD295-F409-44E0-91EC-DF32C7AFCD76@enterprisedb.com

src/backend/commands/amcmds.c

@@ -18,6 +18,7 @@
 #include "catalog/catalog.h"
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
+#include "catalog/objectaccess.h"
 #include "catalog/pg_am.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
@@ -107,6 +108,8 @@ CreateAccessMethod(CreateAmStmt *stmt)
 
 	recordDependencyOnCurrentExtension(&myself, false);
 
+	InvokeObjectPostCreateHook(AccessMethodRelationId, amoid, 0);
+
 	table_close(rel, RowExclusiveLock);
 
 	return myself;