xfs: use per-AG bitmaps to reap unused AG metadata blocks during repair

The AGFL repair code uses a series of bitmaps to figure out where there
are OWN_AG blocks that are not claimed by the free space and rmap
btrees.  These blocks become the new AGFL, and any overflow is reaped.
The bitmaps current track xfs_fsblock_t even though we already know the
AG number.

In the last patch, we introduced a new bitmap "type" for tracking
xfs_agblock_t extents.  Port the reaping code and the AGFL repair to use
this new type, which makes it very obvious what we're tracking.  This
also eliminates a bunch of unnecessary agblock <-> fsblock conversions.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

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