Mark one more __wrap_iter operation as constexpr.

llvm-svn: 337085

diff --git a/libcxx/include/iterator b/libcxx/include/iterator
index 66592b8..9415e0b 100644 (file)
--- a/libcxx/include/iterator
+++ b/libcxx/include/iterator
@@ -1374,7 +1374,8 @@ public:
     }
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator++(int) _NOEXCEPT_DEBUG
         {__wrap_iter __tmp(*this); ++(*this); return __tmp;}
-    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator--() _NOEXCEPT_DEBUG
+
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT_DEBUG
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),