[gn build] Port 1121d64

Author: llvmgnsyncbot

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

@@ -1435,9 +1435,8 @@ if (current_toolchain == default_toolchain) {
       "__tuple/tuple_size.h",
       "__tuple/tuple_types.h",
       "__type_traits/add_cv_quals.h",
-      "__type_traits/add_lvalue_reference.h",
       "__type_traits/add_pointer.h",
-      "__type_traits/add_rvalue_reference.h",
+      "__type_traits/add_reference.h",
       "__type_traits/aligned_storage.h",
       "__type_traits/aligned_union.h",
       "__type_traits/alignment_of.h",