[libcxx] [test] Fix the aligned storage test to work on Windows

[mstorsjo]

Summary

Don't test alignment over 8 KB, which isn't supported on that
platform.

[• Quuxplusone]

libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp

315

Can you add a test case right above this one, for Align=8192, then?

[mstorsjo]

Added testing of specifically 8K alignment.

[Mordante]

LGTM!

[• Quuxplusone]

The ASAN CI failure must be unrelated.

libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // type_traits
 
 // aligned_storage
 //
 //  Issue 3034 added:
 //  The member typedef type shall be a trivial standard-layout type.
 
 #include <type_traits>
#if TEST_STD_VER > 11
     ASSERT_SAME_TYPE(T1, std::aligned_storage_t<10>);
 #endif
     static_assert(std::is_trivial<T1>::value, "");
     static_assert(std::is_standard_layout<T1>::value, "");
     static_assert(std::alignment_of<T1>::value == 8, "");
     static_assert(sizeof(T1) == 16, "");
     }
   {
+    const int Align = 8192;
+    typedef typename std::aligned_storage<1, Align>::type T1;
+    static_assert(std::is_trivial<T1>::value, "");
+    static_assert(std::is_standard_layout<T1>::value, "");
+    static_assert(std::alignment_of<T1>::value == Align, "");
+    static_assert(sizeof(T1) == Align, "");
+  }
+#ifndef _WIN32
+  // Windows only supports alignment up to 8192 bytes.
+  {
     const int Align = 65536;
     typedef typename std::aligned_storage<1, Align>::type T1;
     static_assert(std::is_trivial<T1>::value, "");
     static_assert(std::is_standard_layout<T1>::value, "");
     static_assert(std::alignment_of<T1>::value == Align, "");
     static_assert(sizeof(T1) == Align, "");
   }
+#endif
 
   return 0;
 }