PROBLEM
-------
Function innodb_base_col_setup_for_stored() was skipping to store
the base column information for a generated column if the base column
was a "STORED" generated column. This later causes a crash in function
innoabse_col_check_fk() where it says that a generated columns depends
upon two base columns ,but there is information on only one of them.
There was a explicit check barring the stored columns being stored,
which is wrong because the documentation says that a generated stored
column can be a part of a generated column.

FIX
----
Store the information of base column if it is a stored generated column.

#RB21247
Reviewed by: Debarun Banerjee <debarun.banerjee@oracle.com>