Implement C++17 std::sample.

This patch implements the std::sample function added to C++17 from LFTS. It
also removes the std::experimental::sample implementation which now forwards
to std::sample.

llvm-svn: 279948

1 files changed, 1 insertions, 1 deletions

diff --git a/libcxx/test/support/test_iterators.h b/libcxx/test/support/test_iterators.h
index fb5c06ad943..379933eb51b 100644
--- a/libcxx/test/support/test_iterators.h
+++ b/libcxx/test/support/test_iterators.h
@@ -57,7 +57,7 @@ template <class It,
     class ItTraits = It>
 class input_iterator
 {
-    using Traits = std::iterator_traits<ItTraits>;
+    typedef std::iterator_traits<ItTraits> Traits;
     It it_;
 
     template <class U, class T> friend class input_iterator;