Revert "closure.c: use isl_printer"
Revert "closure.c: use isl_printer"

This reverts commit 77b3b0edae570e439b144d281cf035ec342c00f4.

SaberMod/isl-current,SaberMod/isl-current,SaberMod/isl-current,SaberMod/isl-current