Remove allocation overflow warnings in some gcc versions in release mode

include/boost/container/new_allocator.hpp

@@ -154,7 +154,8 @@ class new_allocator
    //!Throws std::bad_alloc if there is no enough memory
    pointer allocate(size_type count)
    {
-      if(BOOST_UNLIKELY(count > this->max_size()))
+      const std::size_t max_count = std::size_t(-1)/(2*sizeof(T));
+      if(BOOST_UNLIKELY(count > max_count))
          throw_bad_alloc();
       return static_cast<T*>(::operator new(count*sizeof(T)));
    }
@@ -167,7 +168,7 @@ class new_allocator
    //!Returns the maximum number of elements that could be allocated.
    //!Never throws
    size_type max_size() const BOOST_NOEXCEPT_OR_NOTHROW
-   {  return size_type(-1)/sizeof(T);   }
+   {  return std::size_t(-1)/(2*sizeof(T));   }
 
    //!Swaps two allocators, does nothing
    //!because this new_allocator is stateless