Merge branch 'ds/commit-graph-delay-gen-progress'

One kind of progress messages were always given during commit-graph
generation, instead of following the "if it takes more than two
seconds, show progress" pattern, which has been corrected.

* ds/commit-graph-delay-gen-progress:
  commit-graph: use start_delayed_progress()
  progress: create GIT_PROGRESS_DELAY

commit-graph.c

@@ -1100,7 +1100,7 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
 	struct commit_list *list = NULL;
 
 	if (ctx->report_progress)
-		ctx->progress = start_progress(
+		ctx->progress = start_delayed_progress(
 					_("Computing commit graph generation numbers"),
 					ctx->commits.nr);
 	for (i = 0; i < ctx->commits.nr; i++) {