[Polly][Isl] Use isl::union_set::unite() instead of isl::union_set::add_set(). NFC

This is part of an effort to reduce the differences between the custom C++ bindings used right now by polly in `lib/External/isl/include/isl/isl-noxceptions.h` and the official isl C++ interface.

Changes made:
 - Use `isl::union_set::unite()` instead of `isl::union_set::add_set()`
 - `isl-noexceptions.h` has been generated by this https://github.com/patacca/isl/commit/390c44982b5cee7eb43f8f7a80e185e6d21466b2

Depends on D104994

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D105444

1 files changed, 2 insertions, 2 deletions

diff --git a/polly/unittests/DeLICM/DeLICMTest.cpp b/polly/unittests/DeLICM/DeLICMTest.cpp
index 64318a4bc0d9..34a73064246a 100644
--- a/polly/unittests/DeLICM/DeLICMTest.cpp
+++ b/polly/unittests/DeLICM/DeLICMTest.cpp
@@ -27,7 +27,7 @@ isl::union_set unionSpace(const isl::union_set &USet) {
   for (isl::set Set : USet.get_set_list()) {
     isl::space Space = Set.get_space();
     isl::set Universe = isl::set::universe(Space);
-    Result = Result.add_set(Universe);
+    Result = Result.unite(Universe);
   }
   return Result;
 }
@@ -120,7 +120,7 @@ bool checkIsConflictingNonsymmetricCommon(
   auto NewSpace = isl::space(Ctx, 0, 1);
   NewSpace = NewSpace.set_tuple_id(isl::dim::set, NewId);
   auto NewSet = isl::set::universe(NewSpace);
-  Universe = Universe.add_set(NewSet);
+  Universe = Universe.unite(NewSet);
 
   // Using the universe, fill missing data.
   isl::union_set ExistingOccupied;