continuable destroy domain: Make XEN_DOMCTL_destroydomain hypercall con

Make XEN_DOMCTL_destroydomain hypercall continuable.
XEN_DOMCTL_destroydomain hypercall frees domain resources,
especially
it frees all pages of the domain.
When domain memory is very large, it takes too long
resulting in
soft lockup warning message or something worse.
See http://bugzilla.xensource.com/bugzilla/show_bug.cgi?i
d=1037
To fix those issues, make the hypercall continuable and
repeat
the hypercall until the domain is destroyed.


NOTE:
- the patch 1 is same as before.
- I tested this patch by creating/detroying domain.
  However my environment doesn't have enough memory to
  reproduce the issues reported as bugzilla, so I couldn't
test
  if this patch set eliminates the issue.

[PATCH 1/3] continuable destroy domain: common part
[PATCH 2/3] continuable destroy domain: x86 part
[PATCH 3/3] continuable destroy domain: ia64 part

thanks,

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