[gn build] Port 45d493b680e3

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

diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index 898fff1..fc0a065 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -1502,6 +1502,7 @@
       "__type_traits/is_reference.h",
       "__type_traits/is_reference_wrapper.h",
       "__type_traits/is_referenceable.h",
+      "__type_traits/is_replaceable.h",
       "__type_traits/is_same.h",
       "__type_traits/is_scalar.h",
       "__type_traits/is_signed.h",