the reason for the failure were incorrect asserts.

Removing asserts altogether as there is no the implication does not hold
(as explained in the comments for the file).


sql/sql_delete.cc:
  removing two asserts because they can not hold basing on the definition
  of `normal_tables'. The one does not specify in a non-transactional table,
  which must be in the list of tables to be deleted, is modified indeed.
  So, it's possible to have normal_tables == true and deleted == true both
  but that would be yet a transactional table got modified (and then
  thd->transaction.stmt.modified_non_trans_table remains false default).