Write instructions for using valgrind with the debian tor
In #9754 (moved) we have a user experiencing weird heap corruption, or memory corruption, or who knows. It happened for a while and then it stopped happening.
If we'd had easier ways for normal Debian / Ubuntu users to run valgrind on their Tor, we might have gotten a more useful hint.
Also, we probably would have wanted it to be the Tor run the normal way, not a separate Tor run a different way.
Are there easy ways to do this? What's the right way to explain to a normal user how to do it?