dmd 1.048 and 2.033 releases

[Walter Bright]

#ponce wrote:
> I think it's disabled in debug mode to keep the compilation time low. 

That, and the optimizer tends to scramble the relationship between 
source and assembler, making source debugging next to impossible.

> I guess it's more expensive CPU-wise than escape analysis which is done in both modes.
> So it seems the right thing to do for me.