Detailed revision comments:

r6660 | marko | 2010-02-11 11:21:11 +0200 (Thu, 11 Feb 2010) | 7 lines
branches/zip: Clarify the rollback of INSERT by UPDATE of delete-marked rec.

row_undo_mod_remove_clust_low(): Augment the function comment.

row_undo_mod_remove_clust_low(), row_undo_mod_del_mark_or_remove_sec_low(),
row_undo_mod_del_mark_or_remove_sec(), row_undo_mod_upd_del_sec():
Add ut_ad(node->rec_type == TRX_UNDO_UPD_DEL_REC);