xen/sched: Render sibling/core masks with %pbl to improve 'r' debugkey

xen/sched: Render sibling/core masks with %pbl to improve 'r' debugkey

For system with large numbers of CPUs, the 'r' debugkey is unwieldy.  Sibling
and core masks are a single block of adjacent bits, so are vastly shorter to
render with %pbl.

Before:
  (XEN) CPU[00] nr_run=0, sort=157, sibling=00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003, core=00000000,00000000,00000000,00000000,ffffffff,ffffffff,ffffffff,ffffffff
  (XEN) CPU[01] nr_run=0, sort=13750, sibling=00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003, core=00000000,00000000,00000000,00000000,ffffffff,ffffffff,ffffffff,ffffffff
  (XEN) CPU[02] nr_run=0, sort=188, sibling=00000000,00000000,00000000,00000000,00000000,00000000,00000000,0000000c, core=00000000,00000000,00000000,00000000,ffffffff,ffffffff,ffffffff,ffffffff
  (XEN) CPU[03] nr_run=0, sort=13730, sibling=00000000,00000000,00000000,00000000,00000000,00000000,00000000,0000000c, core=00000000,00000000,00000000,00000000,ffffffff,ffffffff,ffffffff,ffffffff

After:
  (XEN) CPU[00] nr_run=0, sort=1169, sibling={0-1}, core={0-127}
  (XEN) CPU[01] nr_run=0, sort=2488, sibling={0-1}, core={0-127}
  (XEN) CPU[02] nr_run=0, sort=1210, sibling={2-3}, core={0-127}
  (XEN) CPU[03] nr_run=0, sort=2476, sibling={2-3}, core={0-127}

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Release-acked-by: Juergen Gross <jgross@suse.com>