[llvm] [LLVM][NVPTX]Add BF16 vector instruction and fix lowering rules (PR #69415)

[Artem Belevich via llvm-commits]

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@@ -490,6 +500,8 @@ NVPTXTargetLowering::NVPTXTargetLowering(const NVPTXTargetMachine &TM,
 
   setBF16OperationAction(ISD::SETCC, MVT::bf16, Legal, Promote);
   setBF16OperationAction(ISD::SETCC, MVT::v2bf16, Legal, Expand);
+  if (getOperationAction(ISD::SETCC, MVT::bf16) == Promote)
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Artem-B wrote:

Nit: move `setBF16OperationAction(ISD::SETCC, MVT::bf16, Legal, Promote)` down here, so the parts relevant to promoting the op are close together.

https://github.com/llvm/llvm-project/pull/69415