show_objects_for_type(): convert to new revindex API

Avoid storing the revindex entry directly, since this structure will
soon be removed from the public interface. Instead, store the offset and
index position by calling 'pack_pos_to_offset()' and
'pack_pos_to_index()', respectively.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

pack-bitmap.c

@@ -711,21 +711,22 @@ static void show_objects_for_type(
 
 		for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
 			struct object_id oid;
-			struct revindex_entry *entry;
-			uint32_t hash = 0;
+			uint32_t hash = 0, index_pos;
+			off_t ofs;
 
 			if ((word >> offset) == 0)
 				break;
 
 			offset += ewah_bit_ctz64(word >> offset);
 
-			entry = &bitmap_git->pack->revindex[pos + offset];
-			nth_packed_object_id(&oid, bitmap_git->pack, entry->nr);
+			index_pos = pack_pos_to_index(bitmap_git->pack, pos + offset);
+			ofs = pack_pos_to_offset(bitmap_git->pack, pos + offset);
+			nth_packed_object_id(&oid, bitmap_git->pack, index_pos);
 
 			if (bitmap_git->hashes)
-				hash = get_be32(bitmap_git->hashes + entry->nr);
+				hash = get_be32(bitmap_git->hashes + index_pos);
 
-			show_reach(&oid, object_type, 0, hash, bitmap_git->pack, entry->offset);
+			show_reach(&oid, object_type, 0, hash, bitmap_git->pack, ofs);
 		}
 	}
 }