Second try at getting noexcept on move and swap for deque. I changed std::alloctor to propagate_on_container_move_assignment so as to make deque<T> move assignment noexcept. What we really need is a compile-time switch that says an allocator always compares equal.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@132490 91177308-0d34-0410-b5e6-96231b3b80d8

include/memory

@@ -1591,6 +1591,8 @@ public:
     typedef const _Tp&        const_reference;
     typedef _Tp               value_type;
 
+    typedef true_type propagate_on_container_move_assignment;
+
     template <class _Up> struct rebind {typedef allocator<_Up> other;};
 
     _LIBCPP_INLINE_VISIBILITY allocator() _NOEXCEPT {}