dmd optimizer now converted to D!

[Joakim]

On Tuesday, 3 July 2018 at 21:57:07 UTC, Walter Bright wrote:
> A small, but important milestone has been achieved!
>
> Many thanks for the help from Sebastian Wilzbach and Rainer 
> Schuetze.

Fantastic, I see that 35 of 88 files in the backend have been 
translated or added in D, with more being done:

https://github.com/dlang/dmd/pulls?q=is%3Apr+is%3Aopen+label%3A"D+Conversion"

Hope we can get DMD 2.082 out as almost fully written in D. :)