xfs: rewrite xfs_reflink_end_cow to use intentsreflink-speedups_2021-10-22

Currently, the code that performs CoW remapping after a write has this
odd behavior where it walks /backwards/ through the data fork to remap
extents in reverse order.  Earlier, we rewrote the reflink remap
function to use deferred bmap log items instead of trying to cram as
much into the first transaction that we could.  Now do the same for the
CoW remap code.  There doesn't seem to be any performance impact; we're
just making better use of code that we added for the benefit of reflink.

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

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