move addRange to islpp.h

This makes it easier to reuse this function in the next commit.

Author: Sven Verdoolaege

tc/core/polyhedral/memory_promotion.cc

@@ -77,14 +77,6 @@ ScopedFootprint outputRanges(isl::map access) {
   footprint.box = access.get_range_simple_fixed_box_hull();
   return footprint;
 }
-
-// Given a set space, construct a map space with the input as domain and
-// a range of the given size.
-isl::space addRange(isl::space space, unsigned dim) {
-  auto range = space.params().unnamed_set_from_params(dim);
-  return space.map_from_domain_and_range(range);
-}
-
 } // namespace
 
 // Access has the shape :: [S -> ref] -> O

tc/external/detail/islpp.h

@@ -280,6 +280,14 @@ inline bool operator!=(const isl::id& id1, const isl::id& id2) {
 ///////////////////////////////////////////////////////////////////////////////
 // Helper functions
 ///////////////////////////////////////////////////////////////////////////////
+
+// Given a set space, construct a map space with the input as domain and
+// a range of the given size.
+inline isl::space addRange(isl::space space, unsigned dim) {
+  auto range = space.params().unnamed_set_from_params(dim);
+  return space.map_from_domain_and_range(range);
+}
+
 // Given a space and a list of values, this returns the corresponding multi_val.
 template <typename T>
 isl::multi_val makeMultiVal(isl::space s, const std::vector<T>& vals) {