[llvm] Adding abdu/abds to canCreateUndefOrPoison (PR #149017)

[Simon Pilgrim via llvm-commits]

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@@ -5619,6 +5619,8 @@ bool SelectionDAG::canCreateUndefOrPoison(SDValue Op, const APInt &DemandedElts,
   case ISD::ADD:
   case ISD::SUB:
   case ISD::MUL:
+  case ISD::ABDU:
+  case ISD::ABDS:
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RKSimon wrote:

Move these up to the same case stack as the min/max opcodes - the set here are for special cases that use flags.

https://github.com/llvm/llvm-project/pull/149017