Merge branch 'bw/object-id'

Conversion from uchar[20] to struct object_id continues.

* bw/object-id: (33 commits)
  diff: rename diff_fill_sha1_info to diff_fill_oid_info
  diffcore-rename: use is_empty_blob_oid
  tree-diff: convert path_appendnew to object_id
  tree-diff: convert diff_tree_paths to struct object_id
  tree-diff: convert try_to_follow_renames to struct object_id
  builtin/diff-tree: cleanup references to sha1
  diff-tree: convert diff_tree_sha1 to struct object_id
  notes-merge: convert write_note_to_worktree to struct object_id
  notes-merge: convert verify_notes_filepair to struct object_id
  notes-merge: convert find_notes_merge_pair_ps to struct object_id
  notes-merge: convert merge_from_diffs to struct object_id
  notes-merge: convert notes_merge* to struct object_id
  tree-diff: convert diff_root_tree_sha1 to struct object_id
  combine-diff: convert find_paths_* to struct object_id
  combine-diff: convert diff_tree_combined to struct object_id
  diff: convert diff_flush_patch_id to struct object_id
  patch-ids: convert to struct object_id
  diff: finish conversion for prepare_temp_file to struct object_id
  diff: convert reuse_worktree_file to struct object_id
  diff: convert fill_filespec to struct object_id
  ...

sequencer.c

@@ -2130,8 +2130,8 @@ cleanup_head_ref:
 			if (read_oneliner(&buf, rebase_path_orig_head(), 0) &&
 			    !get_sha1(buf.buf, orig.hash) &&
 			    !get_sha1("HEAD", head.hash)) {
-				diff_tree_sha1(orig.hash, head.hash,
-					       "", &log_tree_opt.diffopt);
+				diff_tree_oid(&orig, &head, "",
+					      &log_tree_opt.diffopt);
 				log_tree_diff_flush(&log_tree_opt);
 			}
 		}