Mark is_trivially_destructible as unsupported with apple-clang-9

See discussion on https://reviews.llvm.org/D48292

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@359907 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
index 3fc1d83..902f673 100644
--- a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
@@ -5,6 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+// UNSUPPORTED: apple-clang-9
 
 // type_traits