[libc++][ranges] Implement `ranges::stable_sort`.

Differential Revision: https://reviews.llvm.org/D127834

NOKEYCHECK=True
GitOrigin-RevId: 94c7b89fe5b096f85cdddc9c11a1a8112f9409c7
diff --git a/include/module.modulemap.in b/include/module.modulemap.in
index 173f789..3e191dc 100644
--- a/include/module.modulemap.in
+++ b/include/module.modulemap.in
@@ -345,6 +345,7 @@
       module ranges_replace_if               { private header "__algorithm/ranges_replace_if.h" }
       module ranges_reverse                  { private header "__algorithm/ranges_reverse.h" }
       module ranges_sort                     { private header "__algorithm/ranges_sort.h" }
+      module ranges_stable_sort              { private header "__algorithm/ranges_stable_sort.h" }
       module ranges_swap_ranges              { private header "__algorithm/ranges_swap_ranges.h" }
       module ranges_transform                { private header "__algorithm/ranges_transform.h" }
       module ranges_upper_bound              { private header "__algorithm/ranges_upper_bound.h" }