[llvm] [AMDGPU] Accept arbitrary sized sources in CalculateByteProvider (PR #70240)

[Matt Arsenault via llvm-commits]

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@@ -11302,8 +11379,16 @@ static SDValue matchPERM(SDNode *N, TargetLowering::DAGCombinerInfo &DCI) {
       return DAG.getBitcast(MVT::getIntegerVT(32), Op);
   }
 
+  SDValue OtherOp =
+      SecondSrc.has_value() ? *PermNodes[SecondSrc->first].Src : Op;
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arsenm wrote:

Don't need has_value

https://github.com/llvm/llvm-project/pull/70240