Migrating dmd to D?

[Dicebot]

I support the intention and agree that it needs to be done 
part-by-part with no re-factoring allowed to minimize 
regressions. Probably could have even added myself to volunteers, 
but not sure, it looks like a very time-intensive project.

But issues with LDC and GDC need to be settled first. If D 
front-end in D considerably harms any of those, it is a complete 
no-no, even if porting will be perfect. Just not worth the loss.