Merge branch 'nd/pack-struct-commit'

Memory optimization.

* nd/pack-struct-commit:
commit.h: rearrange 'index' to shrink struct commit

diff --combined commit.h
index 10e34e1a18b726b0168a9fe2e4937a23d6cefd11,fd1cbe72634a66b683bdd543a6cdd5c74eb1fe07..c3af512f8b1b90b3963d0921f7ec0d0a43a2fcbe
--- 1/commit.h
--- 2/commit.h
+++ b/commit.h
@@@ -19,17 -19,11 +19,17 @@@ struct commit_list 
  struct commit {
        struct object object;
        void *util;
-       unsigned int index;
        timestamp_t date;
        struct commit_list *parents;
 -      struct tree *tree;
 +
 +      /*
 +       * If the commit is loaded from the commit-graph file, then this
 +       * member may be NULL. Only access it through get_commit_tree()
 +       * or get_commit_tree_oid().
 +       */
 +      struct tree *maybe_tree;
        uint32_t graph_pos;
+       unsigned int index;
  };
  
  extern int save_commit_buffer;
@@@ -108,9 -102,6 +108,9 @@@ void unuse_commit_buffer(const struct c
   */
  void free_commit_buffer(struct commit *);
  
 +struct tree *get_commit_tree(const struct commit *);
 +struct object_id *get_commit_tree_oid(const struct commit *);
 +
  /*
   * Disassociate any cached object buffer from the commit, but do not free it.
   * The buffer (or NULL, if none) is returned.
@@@ -303,10 -294,10 +303,10 @@@ extern const char *find_commit_header(c
  /* Find the end of the log message, the right place for a new trailer. */
  extern int ignore_non_trailer(const char *buf, size_t len);
  
 -typedef void (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
 +typedef int (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
                                 void *cb_data);
  
 -extern void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
 +extern int for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
  
  struct merge_remote_desc {
        struct object *obj; /* the named object, could be a tag */