drop activeStatements

This function is no longer used.  Furthermore, it was supposed to be
used under a no-longer-correct assumption about schedule tree structure.

Author: ftynse

include/tc/core/polyhedral/schedule_transforms.h

@@ -284,13 +284,6 @@ isl::union_set activeDomainPoints(
     const detail::ScheduleTree* root,
     const detail::ScheduleTree* node);
 
-// Get the set of statement identifiers whose domains have at least one active
-// point at the given node, i.e. the statements that were not filtered away on
-// the path from root to node.
-std::unordered_set<isl::id, isl::IslIdIslHash> activeStatements(
-    const detail::ScheduleTree* root,
-    const detail::ScheduleTree* node);
-
 ////////////////////////////////////////////////////////////////////////////////
 // Experimental
 ////////////////////////////////////////////////////////////////////////////////

src/core/polyhedral/schedule_transforms.cc

@@ -135,17 +135,6 @@ isl::union_set activeDomainPoints(
   return domain;
 }
 
-std::unordered_set<isl::id, isl::IslIdIslHash> activeStatements(
-    const ScheduleTree* root,
-    const ScheduleTree* tree) {
-  std::unordered_set<isl::id, isl::IslIdIslHash> ids;
-  auto domain = activeDomainPoints(root, tree).universe();
-  for (auto d : isl::UnionAsVector<isl::union_set>(domain)) {
-    ids.insert(d.get_tuple_id());
-  }
-  return ids;
-}
-
 vector<ScheduleTree*> collectScheduleTreesPath(
     std::function<ScheduleTree*(ScheduleTree*)> next,
     ScheduleTree* start) {