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 multiarr4;
extern(C) int printf(char*, ...);

void main()
{
    char[][] a;
    a.length = 2;
    a[0] = "hello";
    a[1] = "world";
    foreach(v;a)
    {
        printf("%.*s\n", v.length, v.ptr);
    }
}