revert clear-commit-marks for now.

Earlier change broke "git describe A B" among other things.
Revert it for now, and clean the commits smudged by
get_merge_bases using clear_object_marks() function.  For
complex commit ancestry graph, this is way cheaper as well.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/object.c b/object.c
index 37784cee9a..9caba4fac8 100644
--- a/object.c
+++ b/object.c
@@ -217,3 +217,12 @@ void add_object_array(struct object *obj, const char *name, struct object_array
 	objects[nr].name = name;
 	array->nr = ++nr;
 }
+
+void clear_object_marks(unsigned mark)
+{
+	int i;
+
+	for (i = 0; i < obj_allocs; i++)
+		if (objs[i])
+			objs[i]->flags &= ~mark;
+}