Bug #24960450 CONCURRENT DELETE DOESN'T APPLY DURING TABLE REBUILD

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

storage/innobase/row/row0log.cc

 /*****************************************************************************
 
-Copyright (c) 2011, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2011, 2017, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2017, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
@@ -2457,7 +2457,7 @@ row_log_table_apply_op(
 		rec_init_offsets_temp(mrec, new_index, offsets);
 		next_mrec = mrec + rec_offs_data_size(offsets) + ext_size;
 		if (log->table->n_v_cols) {
-			if (next_mrec + 2 >= mrec_end) {
+			if (next_mrec + 2 > mrec_end) {
 				return(NULL);
 			}