[gn build] Port 557e931

Author: llvmgnsyncbot

llvm/utils/gn/secondary/libcxx/include/BUILD.gn

@@ -1195,6 +1195,7 @@ if (current_toolchain == default_toolchain) {
       "__math/traits.h",
       "__math/trigonometric_functions.h",
       "__mbstate_t.h",
+      "__mdspan/aligned_accessor.h",
       "__mdspan/default_accessor.h",
       "__mdspan/extents.h",
       "__mdspan/layout_left.h",
@@ -1219,6 +1220,7 @@ if (current_toolchain == default_toolchain) {
       "__memory/destroy.h",
       "__memory/destruct_n.h",
       "__memory/inout_ptr.h",
+      "__memory/is_sufficiently_aligned.h",
       "__memory/noexcept_move_assign_container.h",
       "__memory/out_ptr.h",
       "__memory/pointer_traits.h",