Disable GC entirely

[Walter Bright]

On 4/8/2013 5:06 AM, Jacob Carlborg wrote:
> I don't know. The thread safe example probably works better with an annotated
> type than nogc.

@nogc would have to be enforced by the compiler. Furthermore, it's viral in that 
much of the runtime library would have to be gone through and marked @nogc, 
otherwise it would be fairly useless.

It's a fairly intrusive change.