[gn build] Port 6d9dfd7

Author: llvmgnsyncbot

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

@@ -1830,6 +1830,8 @@ if (current_toolchain == default_toolchain) {
       "__type_traits/negation.h",
       "__type_traits/promote.h",
       "__type_traits/rank.h",
+      "__type_traits/reference_constructs_from_temporary.h",
+      "__type_traits/reference_converts_from_temporary.h",
       "__type_traits/remove_all_extents.h",
       "__type_traits/remove_const.h",
       "__type_traits/remove_const_ref.h",