[libc++][atomic_ref] annotate wait, notify_one, and notify_all as expected failures

Author: dalg24

libcxx/test/std/atomics/atomics.ref/notify_all.pass.cpp

@@ -6,6 +6,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// XFAIL: *
 
 // void notify_all() const noexcept;
 

libcxx/test/std/atomics/atomics.ref/notify_one.pass.cpp

@@ -6,6 +6,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// XFAIL: *
 
 // void notify_one() const noexcept;
 

libcxx/test/std/atomics/atomics.ref/wait.pass.cpp

@@ -6,6 +6,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
+// XFAIL: *
 
 // void wait(T, memory_order = memory_order::seq_cst) const noexcept;