Fixed some unmerged parts of the D2 frontend. Removed the automatic linker flags for D2 (temp). Renamed a runtime function for D2.

module c;

void main()
{
    ushort a = 0xFFF0;
    ushort b = 0x0FFF;
    auto t = a & b;
    a &= b;
    assert(t == a);
}