[llvm] [DAGCombiner] Share byte provider steps with AMDGPU target (PR #221959)

[Arseniy Obolenskiy via llvm-commits]

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@@ -15184,30 +15185,16 @@ calculateByteProvider(const SDValue &Op, unsigned Index, unsigned Depth,
   if (Index > BitWidth / 8 - 1)
     return std::nullopt;
 
+  auto Recurse = [&](SDValue NextOp, unsigned NextIndex) {
+    return calculateByteProvider(NextOp, NextIndex, Depth + 1, StartingIndex);
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aobolensk wrote:

done


https://github.com/llvm/llvm-project/pull/221959