[gn build] Port aade746

Author: llvmgnsyncbot

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

@@ -911,6 +911,7 @@ if (current_toolchain == default_toolchain) {
       "__utility/cmp.h",
       "__utility/convert_to_integral.h",
       "__utility/declval.h",
+      "__utility/empty.h",
       "__utility/exception_guard.h",
       "__utility/exchange.h",
       "__utility/forward.h",
@@ -924,7 +925,6 @@ if (current_toolchain == default_toolchain) {
       "__utility/priority_tag.h",
       "__utility/rel_ops.h",
       "__utility/swap.h",
-      "__utility/terminate_on_exception.h",
       "__utility/to_underlying.h",
       "__utility/unreachable.h",
       "__variant/monostate.h",