[llvm] [RISCV][ISel] Fold trunc (lshr (add (zext X), (zext Y)), 1) -> vaaddu X, Y (PR #76550)

[Luke Lau via llvm-commits]

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@@ -1375,7 +1379,8 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
 
   setTargetDAGCombine({ISD::INTRINSIC_VOID, ISD::INTRINSIC_W_CHAIN,
                        ISD::INTRINSIC_WO_CHAIN, ISD::ADD, ISD::SUB, ISD::AND,
-                       ISD::OR, ISD::XOR, ISD::SETCC, ISD::SELECT});
+                       ISD::TRUNCATE, ISD::OR, ISD::XOR, ISD::SETCC,
+                       ISD::SELECT});
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lukel97 wrote:

We don't need this since we don't have the combine anymore

https://github.com/llvm/llvm-project/pull/76550