[libc++] Implement P0401R6 (allocate_at_least)

Reviewed By: ldionne, var-const, #libc

Spies: mgorny, libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/D122877

NOKEYCHECK=True
GitOrigin-RevId: a96443eddedc250188b5e5f2b74ae1cf2baf1472
diff --git a/include/module.modulemap b/include/module.modulemap
index ece960f..18b0945 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -708,6 +708,7 @@
 
     module __memory {
       module addressof                       { private header "__memory/addressof.h" }
+      module allocate_at_least               { private header "__memory/allocate_at_least.h" }
       module allocation_guard                { private header "__memory/allocation_guard.h" }
       module allocator                       { private header "__memory/allocator.h" }
       module allocator_arg_t                 { private header "__memory/allocator_arg_t.h" }