Move bits from N4258. Mark vector's move-constructor unconditionally noexcept in C++1z

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@242148 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/vector b/include/vector
index 65a087c..c168c8e 100644
--- a/include/vector
+++ b/include/vector
@@ -553,7 +553,11 @@
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     _LIBCPP_INLINE_VISIBILITY
     vector(vector&& __x)
+#if _LIBCPP_STD_VER > 14
+        _NOEXCEPT;
+#else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
+#endif
     _LIBCPP_INLINE_VISIBILITY
     vector(vector&& __x, const allocator_type& __a);
     _LIBCPP_INLINE_VISIBILITY
@@ -1220,7 +1224,11 @@
 template <class _Tp, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 vector<_Tp, _Allocator>::vector(vector&& __x)
+#if _LIBCPP_STD_VER > 14
+        _NOEXCEPT
+#else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
+#endif
     : __base(_VSTD::move(__x.__alloc()))
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -2195,7 +2203,11 @@
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     _LIBCPP_INLINE_VISIBILITY
     vector(vector&& __v)
+#if _LIBCPP_STD_VER > 14
+        _NOEXCEPT;
+#else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
+#endif
     vector(vector&& __v, const allocator_type& __a);
     _LIBCPP_INLINE_VISIBILITY
     vector& operator=(vector&& __v)
@@ -2785,7 +2797,11 @@
 template <class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 vector<bool, _Allocator>::vector(vector&& __v)
+#if _LIBCPP_STD_VER > 14
+        _NOEXCEPT
+#else
         _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
+#endif
     : __begin_(__v.__begin_),
       __size_(__v.__size_),
       __cap_alloc_(__v.__cap_alloc_)