[llvm] [NVPTX] Fixup some issues introduced by 128-bit atomics (PR #155921)

[Justin Fargnoli via llvm-commits]

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@@ -2325,13 +2325,15 @@ void NVPTXDAGToDAGISel::selectAtomicSwap128(SDNode *N) {
   MemSDNode *AN = cast<MemSDNode>(N);
   SDLoc dl(N);
 
+  const SDValue Chain = N->getOperand(0);
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justinfargnoli wrote:

How does this change relate to the ToT CI failure? 

https://github.com/llvm/llvm-project/pull/155921