As a precursor to live update support, clean up the dom0 creation in
start_xen() a little bit.

This makes it easier for later live update patches to make it
conditional, since in live update we'll already have an existing dom0
being brought over from the previous Xen. But it's a cleanup in its own
right in the meantime.

David Woodhouse (2):
      x86/setup: simplify handling of initrdidx when no initrd present
      x86/setup: lift dom0 creation out into create_dom0() function


xen/arch/x86/setup.c | 175 ++++++++++++++++++++++++++++-----------------------
 1 file changed, 95 insertions(+), 80 deletions(-)
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