xfs: fix broken MAXREFCOUNT handling

This series fixes a bug in the refcount code where we don't merge
records correctly if the refcount is hovering around MAXREFCOUNT.  This
fixes regressions in xfs/179 when fsdax is enabled.  xfs/179 itself will
be modified to exploit the bug through the pagecache path.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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