Analysis:
========
During alter table rebuild, InnoDB fails to apply concurrent delete log.
Parsing and validation of merge record happens while applying the
log operation on a table. Validation goes wrong for the virtual column.
Validation assumes that virtual column information can't be the end
of the merge record end.

Fix:
====
Virtual column information in the merge record can be end of the merge
record. Virtual column information is written at the end for
row_log_table_delete().

Reviewed-by: Satya Bodapati<satya.bodapati@oracle.com>
RB: 16155