[libcxx] expose experimental::erased_type for all standard versions.

Summary: The polymorphic allocator implementation would greatly benefit by defining virtual functions in the dynlib instead of inline. In order to do that some types are going to have to be available outside of c++1y. This is the first step.

Reviewers: mclow.lists, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D4554

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@213889 91177308-0d34-0410-b5e6-96231b3b80d8

include/experimental/utility

@@ -33,8 +33,6 @@ inline namespace fundamentals_v1 {
 
 # include <experimental/__config>
 
-#if _LIBCPP_STD_VER > 11
-
 # include <utility>
 
 _LIBCPP_BEGIN_NAMESPACE_LFTS
@@ -43,6 +41,4 @@ _LIBCPP_BEGIN_NAMESPACE_LFTS
 
 _LIBCPP_END_NAMESPACE_LFTS
 
-#endif /* _LIBCPP_STD_VER > 11 */
-
 #endif /* _LIBCPP_EXPERIMENTAL_UTILITY */

test/experimental/utilities/utility/utility.erased.type/erased_type.pass.cpp

@@ -13,8 +13,5 @@
 
 int main()
 {
-#if _LIBCPP_STD_VER > 11
-    using std::experimental::erased_type;
-    constexpr erased_type e{};
-#endif
+    std::experimental::erased_type e();
 }

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

@@ -11,11 +11,10 @@
 
 #include <experimental/utility>
 
+#ifndef _LIBCPP_UTILITY
+#   error "<experimental/utility> must include <utility>"
+#endif
+
 int main()
 {
-#if _LIBCPP_STD_VER > 11
-# ifndef _LIBCPP_UTILITY
-#   error "<experimental/utility> must include <utility>"
-# endif
-#endif /* _LIBCPP_STD_VER > 11 */
 }