[RFC] D support for S/390

[Robin Dapp]

> This would mean that StructFlags and ClassFlags will also both have a
> wrong value as well.

Yes, can confirm that m_flags = 0 (instead of 1) for a struct containing
a pointer.

> If there's a compiler/library discrepancy, the compiler should be
> adjusted to write out the value at the correct size.
> 
> I think the following below should do it.

The diff fixes the problems for me.  I first encountered the algn = 0 in
an associative array and couldn't immediately link it to structs.  In
order to make pinpointing easier in the future I wrote a simple test
case for this that I'm going to post with the next diff.

Regards
 Robin