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 tangotests.align1;

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

struct TLA
{
    char[3] tla;
    char[] toString() { return tla; }
    void dump()
    {
        printf("%.*s\n", 3, tla.ptr);
    }
}

void main()
{
    TLA fbi = TLA("FBI");
    fbi.dump();
}