[llvm] [NVPTX] Rework and cleanup FTZ ISel (PR #146410)

[Princeton Ferro via llvm-commits]

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@@ -397,45 +403,29 @@ static unsigned getPTXCmpMode(const CondCodeSDNode &CondCode, bool FTZ) {
       return CmpMode::LEU;
     case ISD::SETUNE:
       return CmpMode::NEU;
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Prince781 wrote:

Given how you've defined `CmpMode` in terms of SDNode opcodes, couldn't you just return the opcode for these cases?

https://github.com/llvm/llvm-project/pull/146410