sha1_file: restore OBJECT_INFO_QUICK functionality

Support for the OBJECT_INFO_QUICK flag in sha1_object_info_extended()
was added in commit dfdd4af ("sha1_file: teach
sha1_object_info_extended more flags", 2017-06-26) in order to support
commit e83e71c ("sha1_file: refactor has_sha1_file_with_flags",
2017-06-26), but it was inadvertently removed in commit 8b4c010
("sha1_file: support lazily fetching missing objects", 2017-12-08).

Restore this functionality.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jonathantanmy

sha1_file.c

@@ -1189,9 +1189,11 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
 			return 0;
 
 		/* Not a loose object; someone else may have just packed it. */
-		reprepare_packed_git();
-		if (find_pack_entry(real, &e))
-			break;
+		if (!(flags & OBJECT_INFO_QUICK)) {
+			reprepare_packed_git();
+			if (find_pack_entry(real, &e))
+				break;
+		}
 
 		/* Check if it is a missing object */
 		if (fetch_if_missing && repository_format_partial_clone &&