[libc++] Add FreeBSD XFAILs in preparation for CI

This at least allows us to stand up libc++ FreeBSD CI and avoid future
regressions.  The failures do need to be addressed, and can be done
iteratively.

Reviewed By: philnik, Mordante

Differential Revision: https://reviews.llvm.org/D141542

NOKEYCHECK=True
GitOrigin-RevId: 7ec6c629052c30c0772e8fcae346a405af43444e
diff --git a/test/thread_local_destruction_order.pass.cpp b/test/thread_local_destruction_order.pass.cpp
index e256360..9daf966 100644
--- a/test/thread_local_destruction_order.pass.cpp
+++ b/test/thread_local_destruction_order.pass.cpp
@@ -9,6 +9,8 @@
 // UNSUPPORTED: c++03
 // UNSUPPORTED: no-threads
 
+// XFAIL: LIBCXX-FREEBSD-FIXME
+
 #include <cassert>
 #include <thread>