Garbage Collectors

[Richard (Rikki) Andrew Cattermole]

Its not as simple as porting to the API unfortunately.

We don't have barriers of any kind, so that removes most GC designs you 
would want to use today. We are very close to maxing out what we can do 
as a result.

A whole pile of logic is hidden in rt, so you have no choice but to 
either do the work to fix that, or recompile druntime with your GC.