dmd codegen improvements

[Walter Bright via Digitalmars-d]

On 8/18/2015 3:07 PM, Joseph Rushton Wakeling wrote:
> I was backing up your rationale, even if I disagree with your
> prioritizing these concerns at this stage of the dmd => ddmd transition.

I want to move to ddmd right now, and I mean right now. But it's stalled, 
awaiting Daniel and Martin.

https://github.com/D-Programming-Language/dmd/pull/4884

I thought I'd investigate back end issues while waiting, as Martin is very 
concerned about the ddmd compile speed.