Packed union doesn't make the unaligned magic on ms_bitfield

[Eric Christopher]

> But how should it be handled?  Eric and I can't find any abi stuff
> about it.
>
> --
> 	*stor-layout.c (update_alignment_for_field): Don't add extra
> 	alignment for packed non-bitfield fields in ms_bitfield_layout_p
> 	code.

FWIW I'm ok with the patch since it doesn't affect any corner case I  
know about in the MS compiler.

-eric