staging/lustre: shrink lu_object_header by 8 bytes on x86_64

Locate the loh_flags and loh_ref fields together in lu_object_header
to avoid holes and shrink the structure by 8 bytes.
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-on: http://review.whamcloud.com/9185
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3059Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Liang Zhen <liang.zhen@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lu_object.h

@@ -515,6 +515,10 @@ enum lu_object_header_attr {
  * whether object is backed by persistent storage entity.
  */
 struct lu_object_header {
+	/**
+	 * Fid, uniquely identifying this object.
+	 */
+	struct lu_fid		loh_fid;
 	/**
 	 * Object flags from enum lu_object_header_flags. Set and checked
 	 * atomically.
@@ -524,10 +528,6 @@ struct lu_object_header {
 	 * Object reference count. Protected by lu_site::ls_guard.
 	 */
 	atomic_t	   loh_ref;
-	/**
-	 * Fid, uniquely identifying this object.
-	 */
-	struct lu_fid	  loh_fid;
 	/**
 	 * Common object attributes, cached for efficiency. From enum
 	 * lu_object_header_attr.