add dump of data dependences

add dump of data dependences

2015-10-07  Aditya Kumar  <aditya.k7@samsung.com>
                Sebastian Pop  <s.pop@samsung.com>

                * graphite-dependences.c (scop_get_dependences): Add dump of the
                data dependence graph.
                * graphite-poly.c (print_isl_union_map): New.
                (debug_isl_union_map): New.
                * graphite-poly.h (print_isl_union_map): Declare.
                (debug_isl_union_map): Declare.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@228677 138bc75d-0d04-0410-961f-82ee72b054a4