Fix some unittests for 64-bit asm. They were operating on int variables as if they were longs. This was causing asm1_1 to fail when compiled with -O3 because it was overwriting the spilled value of callee-saved register %rbx, which the runtime was using as a pointer value at the time.

module globals2;

template Bool(bool b)
{
    const bool Bool = b;
}

void main()
{
    assert(Bool!(true));
    assert(!Bool!(false));
}