[llvm] [BPF] TableGen-erate SDNode descriptions (PR #166499)

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eddyz87 wrote:

> > Do you know why we do not have problems before for BR_CC/MRMCPY?
> 
> SelectionDAG is very permissive about such inconsistencies. Fixing it to be more robust is my end goal.
> 
> > Looks like WASM is correct and the other three need update...
> 
> LanaiISD::BR_CC uses SDNPInGlue because it "glues" a comparison to the branch. In BPF comparison and branch a fused into one BPFISD::BR_CC node (same as LoongArch).
> 
> ARMISD::MEMCPY is indeed incorrect in that it shouldn't have SDNPInGlue. I'm not sure if it needs an out glue, but at least its presence is consistent with C++ code.
> 
> Whether or not to use glue operands/results is really target-dependent.

Ack, thank you for explaining.

https://github.com/llvm/llvm-project/pull/166499