Implement LWG Issue #2285 - make_reverse_iterator. Also mark issues #1450 and #2205 as complete; they are just wording changes in the standard. Mark issues #2359, #2320 and #2322 as complete - libc++ implements them already.

llvm-svn: 202671
diff --git a/libcxx/include/iterator b/libcxx/include/iterator
index b1bcdfc..7bfd049 100644
--- a/libcxx/include/iterator
+++ b/libcxx/include/iterator
@@ -138,6 +138,8 @@
 reverse_iterator<Iterator>
 operator+(typename reverse_iterator<Iterator>::difference_type n, const reverse_iterator<Iterator>& x);
 
+template <class Iterator> reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14
+
 template <class Container>
 class back_insert_iterator
 {
@@ -633,6 +635,15 @@
     return reverse_iterator<_Iter>(__x.base() - __n);
 }
 
+#if _LIBCPP_STD_VER > 11
+template <class _Iter>
+inline _LIBCPP_INLINE_VISIBILITY
+reverse_iterator<_Iter> make_reverse_iterator(_Iter __i)
+{
+    return reverse_iterator<_Iter>(__i);
+}
+#endif
+
 template <class _Container>
 class _LIBCPP_TYPE_VIS_ONLY back_insert_iterator
     : public iterator<output_iterator_tag,