functional cleanup for __attribute__((packed)) changes

functional cleanup for __attribute__((packed)) changes

This is to separate the functional changes from the noop consistency changes.

* Pack struct cper_mce_record rather than creating a structure named __packed
* Remove unreferenced struct xgt_desc
* Use two u16's rather than two u32 16-bit bitfields

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Also drop now pointless (and always having been bogus) pack pragmas.

Signed-off-by: Jan Beulich <jbeulich@suse.com>