[libcxx][ranges] Add `views::counted` CPO.

Differential Revision: https://reviews.llvm.org/D106923

NOKEYCHECK=True
GitOrigin-RevId: f9e58f35e905c457ac81e951f22e3b2de3a7dc45
diff --git a/include/module.modulemap b/include/module.modulemap
index 7f8c3bc..e07709d 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -622,6 +622,7 @@
       module common_view            { private header "__ranges/common_view.h"           }
       module concepts               { private header "__ranges/concepts.h"              }
       module copyable_box           { private header "__ranges/copyable_box.h"          }
+      module counted                { private header "__ranges/counted.h"               }
       module dangling               { private header "__ranges/dangling.h"              }
       module data                   { private header "__ranges/data.h"                  }
       module drop_view              { private header "__ranges/drop_view.h"             }