xfs: cache pages used for xfarray quicksort convergence

After quicksort picks a pivot item for a particular subsort, it walks
the records in that subset from the outside in, rearranging them so that
every record less than the pivot comes before it, and every record
greater than the pivot comes after it.  This scan has a lot of locality,
so we can speed it up quite a bit by grabbing the xfile backing page and
holding onto it as long as we possibly can.  Doing so reduces the
runtime by another 5% on the author's computer.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Kent Overstreet <[email protected]>
Reviewed-by: Dave Chinner <[email protected]>

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