[libcxx][ranges] Add `ranges::join_view`.

Differential Revision: https://reviews.llvm.org/D107671

NOKEYCHECK=True
GitOrigin-RevId: df324bba5c4cc0309ef4bc756fab4ebb6d67dfba
diff --git a/include/module.modulemap b/include/module.modulemap
index 079dff2..f9955a3 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -659,6 +659,7 @@
       module enable_borrowed_range  { private header "__ranges/enable_borrowed_range.h" }
       module enable_view            { private header "__ranges/enable_view.h"           }
       module iota_view              { private header "__ranges/iota_view.h"             }
+      module join_view              { private header "__ranges/join_view.h"             }
       module non_propagating_cache  { private header "__ranges/non_propagating_cache.h" }
       module ref_view               { private header "__ranges/ref_view.h"              }
       module reverse_view           { private header "__ranges/reverse_view.h"          }