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.

module bug24;
extern(C) int printf(char*, ...);

struct S
{
    long l;
    float f;
}

void main()
{
    S s = S(3L,2f);
    delegate {
        S t = S(4L, 1f);
        delegate {
            s.l += t.l;
            s.f += t.f;
        }();
    }();
    printf("%lu %f\n", s.l, s.f);
    assert(s.l == 7 && s.f == 3);
}