[Polly] Use the new access function (if present) to compute the access stride.

[jdoerfert]

Added a test case

[jdoerfert]

Closed by commit rL219499 (authored by @jdoerfert).

lib/Analysis/ScopInfo.cpp

static isl_map *getEqualAndLarger(isl_space *setDomain) {
   Map = isl_map_add_constraint(Map, c);
 
   isl_local_space_free(MapLocalSpace);
   return Map;
 }
 
 isl_set *MemoryAccess::getStride(__isl_take const isl_map *Schedule) const {
   isl_map *S = const_cast<isl_map *>(Schedule);
-  isl_map *AccessRelation = getAccessRelation();
+  isl_map *AccessRelation = getNewAccessRelation();
+  if (!AccessRelation)
+    AccessRelation = getAccessRelation();
   isl_space *Space = isl_space_range(isl_map_get_space(S));
   isl_map *NextScatt = getEqualAndLarger(Space);
 
   S = isl_map_reverse(S);
   NextScatt = isl_map_lexmin(NextScatt);
 
   NextScatt = isl_map_apply_range(NextScatt, isl_map_copy(S));
   NextScatt = isl_map_apply_range(NextScatt, isl_map_copy(AccessRelation));