Revert Add <optional>. Will recommit with better commit message

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@283978 91177308-0d34-0410-b5e6-96231b3b80d8

test/libcxx/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp

@@ -1,81 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03, c++11, c++14
-// XFAIL: libcpp-no-exceptions
-// <optional>
-
-// optional<T>& operator=(const optional<T>& rhs);
-
-#include <optional>
-#include <string>
-#include <type_traits>
-
-using std::optional;
-
-struct X {};
-
-struct Y
-{
-    Y() = default;
-    Y& operator=(const Y&) { return *this; }
-};
-
-struct Z1
-{
-    Z1() = default;
-    Z1(Z1&&) = default;
-    Z1(const Z1&) = default;
-    Z1& operator=(Z1&&) = default;
-    Z1& operator=(const Z1&) = delete;
-};
-
-struct Z2
-{
-    Z2() = default;
-    Z2(Z2&&) = default;
-    Z2(const Z2&) = delete;
-    Z2& operator=(Z2&&) = default;
-    Z2& operator=(const Z2&) = default;
-};
-
-#if __cplusplus >= 201402
-template <class T>
-constexpr bool
-test()
-{
-    optional<T> opt;
-    optional<T> opt2;
-    opt = opt2;
-    return true;
-}
-#endif
-
-int main()
-{
-    {
-        using T = int;
-        static_assert((std::is_trivially_copy_assignable<optional<T>>::value), "");
-#if __cplusplus >= 201402
-        static_assert(test<T>(), "");
-#endif
-    }
-    {
-        using T = X;
-        static_assert((std::is_trivially_copy_assignable<optional<T>>::value), "");
-#if __cplusplus >= 201402
-        static_assert(test<T>(), "");
-#endif
-    }
-    static_assert(!(std::is_trivially_copy_assignable<optional<Y>>::value), "");
-    static_assert(!(std::is_trivially_copy_assignable<optional<std::string>>::value), "");
-
-    static_assert(!(std::is_copy_assignable<optional<Z1>>::value), "");
-    static_assert(!(std::is_copy_assignable<optional<Z2>>::value), "");
-}