[gn build] Port e475bb7

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Differential Revision: https://phabricator.intern.facebook.com/D60251449

Author: llvmgnsyncbot

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

@@ -604,6 +604,8 @@ if (current_toolchain == default_toolchain) {
       "__memory/concepts.h",
       "__memory/construct_at.h",
       "__memory/destruct_n.h",
+      "__memory/inout_ptr.h",
+      "__memory/out_ptr.h",
       "__memory/pointer_traits.h",
       "__memory/ranges_construct_at.h",
       "__memory/ranges_uninitialized_algorithms.h",