Source control for all dmd source

[Walter Bright]

Jason House wrote:
> Over in D.anounce, the LDC devs said they would have an easier time
> upgrading to newer dmd (fe) versions if the source was in source
> control. Even if Walter is the only one with write access, it's still
> be helpful. It's helpful for more than just the LDC folks; that's
> just the most recent example.
> 
> How about it Walter? IIRC, Andrei has been encouraging you to do
> this for awhile now.

It's a great idea, I just haven't gotten my act together yet.