isl_basic_map_realign: drop redundant call to isl_basic_map_cow
isl_basic_map_realign: drop redundant call to isl_basic_map_cow

isl_basic_map_realign does not modify its basic map argument,
but instead creates a new basic map, so there is no need to
call isl_basic_map_cow.  The call was already redundant
when it was introduced in isl-0.03-96-gbe01bd1cee (align parameters
of union arguments to binary functions, Tue Aug 24 21:01:20 2010 +0200).

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

PollyLabs/isl,Meinersbur/isl,PollyLabs/isl,PollyLabs/isl,Meinersbur/isl,inducer/isl-mirror,Meinersbur/isl,inducer/isl-mirror,inducer/isl-mirror,PollyLabs/isl,inducer/isl-mirror,Meinersbur/isl,inducer/isl-mirror,PollyLabs/isl