Fixed a critical bug in the runtime, where _d_allocmemoryT would mark the memory block as having pointers (for scanning) opposite of what it should. So pointers would not be seen and freed. Should fix a bunch of regressions with AAs.

module structs6;

struct S
{
    float f;
}

void func(S s)
{
}

void main()
{
    func(S());
}