Don't do that. HardenedBSD is rather a one man project, who's patches have been reviewed and rejected by FreeBSD developers due to bad quality, poor design and lack of cooperation in bringing them to FreeBSD expected standards. It seems like a PR campaign from people who can write some C, but don't have much credibility in writing secure operating systems or production ready code. Beside the quality of the proposed solutions, there was nothing in the FreeBSD project stopping the code from being accepted. Wether the bad ASLR implementation or no implementation is worse, it's up to you to decide, but I'll vote for quality first.