[gn build] Port 764834d

Author: llvmgnsyncbot

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

@@ -575,6 +575,7 @@ if (current_toolchain == default_toolchain) {
       "__locale_dir/locale_base_api/openbsd.h",
       "__locale_dir/locale_base_api/win32.h",
       "__locale_dir/locale_guard.h",
+      "__locale_dir/pad_and_output.h",
       "__locale_dir/support/apple.h",
       "__locale_dir/support/bsd_like.h",
       "__locale_dir/support/freebsd.h",
@@ -668,6 +669,7 @@ if (current_toolchain == default_toolchain) {
       "__numeric/transform_reduce.h",
       "__ostream/basic_ostream.h",
       "__ostream/print.h",
+      "__ostream/put_character_sequence.h",
       "__pstl/backend.h",
       "__pstl/backend_fwd.h",
       "__pstl/backends/default.h",