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 mini.nested14;

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

class C
{
  void foo()
  {
    void bar()
    {
       car();
    }

    bar();
  }

  void car()
  {
    printf("great\n");
  }
}

void main()
{
  scope c = new C;
  c.foo();
}