Added IrTypeFunction and IrTypeDelegate and eliminated IrDType. This means the Type::ir field can be removed. It's the final part needed for the move to a slightly more sane type system. Now the whole thing just needs to be cleaned up :P Added -v-cg switch, which right now just prints "codegen: module.name (module/name.d)" to stdout, this can really help figuring out where, in some complex build command, things go wrong.

void foo()
{
    version(X86)
    asm
    {
        naked;
        jmp pass;
        hlt;
pass:   ret;
    }
    else version(X86_64)
    asm
    {
        naked;
        jmp pass;
        hlt;
pass:   ret;
    }
    else static assert(0, "todo");
}

void main()
{
    foo();
}