[llvm] [DAGCombiner] Add basic support for `trunc nsw/nuw` (PR #113808)

[Nikita Popov via llvm-commits]

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@@ -2552,14 +2552,19 @@ bool TargetLowering::SimplifyDemandedBits(
   }
   case ISD::TRUNCATE: {
     SDValue Src = Op.getOperand(0);
+    SDNodeFlags Flags = Op->getFlags();
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nikic wrote:

Unused Flags variable?

https://github.com/llvm/llvm-project/pull/113808