Merge branch 'rs/pack-bits-in-object-better'

By renumbering object flag bits, "struct object" managed to lose
bloated inter-field padding.

* rs/pack-bits-in-object-better:
  revision: reallocate TOPO_WALK object flags

Author: gitster

object.h

@@ -58,7 +58,7 @@ struct object_array {
 
 /*
  * object flag allocation:
- * revision.h:               0---------10         15                   25----28
+ * revision.h:               0---------10         15             23------26
  * fetch-pack.c:             01
  * negotiator/default.c:       2--5
  * walker.c:                 0-2
@@ -78,7 +78,7 @@ struct object_array {
  * builtin/show-branch.c:    0-------------------------------------------26
  * builtin/unpack-objects.c:                                 2021
  */
-#define FLAG_BITS  29
+#define FLAG_BITS  28
 
 /*
  * The object type is stored in 3 bits.

revision.h

@@ -37,6 +37,10 @@
 
 /* WARNING: This is also used as REACHABLE in commit-graph.c. */
 #define PULL_MERGE	(1u<<15)
+
+#define TOPO_WALK_EXPLORED	(1u<<23)
+#define TOPO_WALK_INDEGREE	(1u<<24)
+
 /*
  * Indicates object was reached by traversal. i.e. not given by user on
  * command-line or stdin.
@@ -48,9 +52,6 @@
 #define TRACK_LINEAR	(1u<<26)
 #define ALL_REV_FLAGS	(((1u<<11)-1) | NOT_USER_GIVEN | TRACK_LINEAR | PULL_MERGE)
 
-#define TOPO_WALK_EXPLORED	(1u<<27)
-#define TOPO_WALK_INDEGREE	(1u<<28)
-
 #define DECORATE_SHORT_REFS	1
 #define DECORATE_FULL_REFS	2