After collapsing barrier sets, it seems like CardTableModRefBS is the only barrier set that encodes "ModRef" in its name and uses the "BS" suffix instead of spelling out "BarrierSet".
This is an inconsistency that ought to be changed by renaming CardTableModRefBS to CardTableBarrierSet.
This is an inconsistency that ought to be changed by renaming CardTableModRefBS to CardTableBarrierSet.