Struct alignment

[Johan Engelen]

DMD <= 2.074  and DMD >= 2.075 disagree on struct alignment.

```
struct UInt {
align(1):
     uint a;
}

struct Bug {
     ubyte one;
     UInt two;
}

static assert(Bug.two.offsetof == 4); // Error DMD>=2.075, 1 == 4 
is false
static assert(Bug.sizeof == 8); // Error DMD>=2.075, 5 == 8 is 
false

align(1)
struct Align1UInt {
align(1):
     uint a;
}

struct BugAlign1 {
     ubyte one;
     Align1UInt two;
}

static assert(BugAlign1.two.offsetof == 1);
static assert(BugAlign1.sizeof == 5); // Error DMD<=2.074, 8 == 5 
is false
```

So... what's correct? :-)

Cheers,
   Johan