[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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@@ -111,6 +111,7 @@ def riscv_ctlz_vl       : SDNode<"RISCVISD::CTLZ_VL",       SDT_RISCVIntUnOp_VL>
 def riscv_cttz_vl       : SDNode<"RISCVISD::CTTZ_VL",       SDT_RISCVIntUnOp_VL>;
 def riscv_ctpop_vl      : SDNode<"RISCVISD::CTPOP_VL",      SDT_RISCVIntUnOp_VL>;
 
+def riscv_avgflooru_vl   : SDNode<"RISCVISD::AVGFLOORU_VL", SDT_RISCVIntBinOp_VL, [SDNPCommutative]>;
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lukel97 wrote:

Tiny nit: Can align the `:` here

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