[libcxx] Add <experimental/utility> header for LFTS.

Summary:
This patch adds the `<experimental/utility>` header as specified in the latest draft of the library fundamentals TS.

`<experimental/utility>` only contains `class erased_type`. 

This patch also updates the documentation to list the `erased_type` class as "initial implementation complete".

Test Plan:
Three test cases where added:

1. Test that `_LIBCPP_VERSION` is defined.
2. Test that `<utility>` has been included.
3. Test that `erased_type` is in the correct namespace and is constexpr default constructible.

Reviewers: mclow.lists

Reviewed By: mclow.lists

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D4510

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@213226 91177308-0d34-0410-b5e6-96231b3b80d8

test/experimental/utilities/utility/utility.synop/includes.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/utility>
+
+#include <experimental/utility>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+# ifndef _LIBCPP_UTILITY
+#   error "<experimental/utility> must include <utility>"
+# endif
+#endif /* _LIBCPP_STD_VER > 11 */
+}