[Dlang-internal] Enabling GC in the compiler library

[RazvanN via Dlang-internal]

Hi all,

Currently the compiler disbles the GC before doing anything, so I 
am doing the same thing with the parser library implementation 
which was merged a little while ago. Since its unacceptable for a 
library to not be GCed, I was wondering what would it be 
necessary to make the compiler GCable. Last time I tried to build 
dmd with GC, I couldn't compile druntime or phobos, so I wanted 
to know what was the first feature that needed GC.disable()?

Best regards,
RazvanN