[libc++][test] XFAIL for FreeBSD in thread_create_failure.pass.cpp (#129413)
Per https://man.freebsd.org/cgi/man.cgi?query=setrlimit, FreeBSD's
`setrlimit` seems to limit the number of processes, not threads via
`RLIMIT_NPROC`. So this test should be XFAIL for FreeBSD.
diff --git a/libcxx/test/std/thread/futures/futures.async/thread_create_failure.pass.cpp b/libcxx/test/std/thread/futures/futures.async/thread_create_failure.pass.cpp
index 0d0c630..d4f7cb7 100644
--- a/libcxx/test/std/thread/futures/futures.async/thread_create_failure.pass.cpp
+++ b/libcxx/test/std/thread/futures/futures.async/thread_create_failure.pass.cpp
@@ -17,9 +17,10 @@
// There is no way to limit the number of threads on windows
// UNSUPPORTED: windows
-// AIX and macOS seem to limit the number of processes, not threads via RLIMIT_NPROC
+// AIX, FreeBSD, and macOS seem to limit the number of processes, not threads via RLIMIT_NPROC
// XFAIL: target={{.+}}-aix{{.*}}
// XFAIL: target={{.+}}-apple-{{.*}}
+// XFAIL: freebsd
// This test makes sure that we fail gracefully in care the thread creation fails. This is only reliably possible on
// systems that allow limiting the number of threads that can be created. See https://llvm.org/PR125428 for more details
