[libc++] [P1614] Implement std::compare_three_way.

Differential Revision: https://reviews.llvm.org/D110735

NOKEYCHECK=True
GitOrigin-RevId: 3df094d31eac753687c7963738bb847e6d3794e9
diff --git a/include/module.modulemap b/include/module.modulemap
index 5abe243..d8049cb 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -372,6 +372,7 @@
 
     module __compare {
       module common_comparison_category { private header "__compare/common_comparison_category.h" }
+      module compare_three_way          { private header "__compare/compare_three_way.h"          }
       module compare_three_way_result   { private header "__compare/compare_three_way_result.h"   }
       module is_eq                      { private header "__compare/is_eq.h"                      }
       module ordering                   { private header "__compare/ordering.h"                   }