Concern about dmd memory usage on win32

[monarch_dodra]

In particular, when compiling "-unittest std\algorithm.d", dmd 
uses *nearly* 1 GB (it uses about 1,051,176K on my machine).

Problem is that when it reaches 1GB, it crashes. I have a pull 
request which adds a few unittests to algorithm, and it is 
consistently crashing on win32 with an out of memory error.

In layman's terms: std\algorithm.d is full. You literally can't 
add any more unittests to it, without crashing dmd on win32.

I'd have recommended splitting the unittests in sub-modules or 
whatnot, but come to think about it, I'm actually more concern 
that a module could *singlehandedly* make the compiler crash on 
out of memory...

Also, I'm no expert, but why is my dmd limited to 1 GB memory on 
my 64 bit machine...?