[llvm] [NVPTX] Fix lowering of i1 SETCC (PR #115035)

[Justin Fargnoli via llvm-commits]

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@@ -668,6 +668,11 @@ NVPTXTargetLowering::NVPTXTargetLowering(const NVPTXTargetMachine &TM,
     setTruncStoreAction(VT, MVT::i1, Expand);
   }
 
+  setCondCodeAction({ISD::SETNE, ISD::SETEQ, ISD::SETUGE, ISD::SETULE,
+                     ISD::SETUGT, ISD::SETULT, ISD::SETGT, ISD::SETLT,
+                     ISD::SETGE, ISD::SETLE},
+                    MVT::i1, Custom);
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justinfargnoli wrote:

If it makes sense for something to live in `.../CodeGen/SelectionDAG/*`, I think we should implement it there instead of in `.../Target/NVPTX/*`. 

This is also my assumption of what @arsenm was asking for [above](https://github.com/llvm/llvm-project/pull/115035#discussion_r1829788004). 

CC @arsenm to correct me. 

https://github.com/llvm/llvm-project/pull/115035