N3142.  Many of these traits are just placeholders with medium quality emulation; waiting on compiler intrinsics to do it right.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119854 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/iterator b/include/iterator
index 0ad489b..6fcb259 100644
--- a/include/iterator
+++ b/include/iterator
@@ -1038,7 +1038,7 @@
 template <class _Tp>
 typename enable_if
 <
-    has_trivial_copy_assign<_Tp>::value,
+    is_trivially_copy_assignable<_Tp>::value,
     _Tp*
 >::type
 __unwrap_iter(__wrap_iter<_Tp*>);
@@ -1137,7 +1137,7 @@
     friend
     typename enable_if
     <
-        has_trivial_copy_assign<_Tp>::value,
+        is_trivially_copy_assignable<_Tp>::value,
         _Tp*
     >::type
     __unwrap_iter(__wrap_iter<_Tp*>);