[svn r15] * Fixed a bunch problems with virtual calls. Seems I did some rather poor testing. * Now 50/51 tests compile. * Added a simple runalltests.d scripts that should be run with 'gdmd -run runalltests.d' - LLVMDC will not compile it yet.

module c;

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