isl_pw_*_eval: rename "pnt_dim" variable to "pnt_space"
isl_pw_*_eval: rename "pnt_dim" variable to "pnt_space"

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

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