[Support] Add KnownBits::abds signed absolute difference and rename absdiff -> abdu (#84897)
When I created KnownBits::absdiff, I totally missed that we already have ISD::ABDS/ABDU nodes, and we use this term in other places/targets as well. I've added the KnownBits::abds implementation and renamed KnownBits::absdiff to KnownBits::abdu. Followup to #84791
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