[llvm] [X86] TableGen-erate SDNode descriptions (PR #168421)

[Craig Topper via llvm-commits]

================
@@ -16,6 +16,8 @@
 
 def SDTRAOBinaryArith : SDTypeProfile<0, 2, [SDTCisPtrTy<0>, SDTCisInt<1>]>;
 
+/// RAO arithmetic instructions.
+/// OUTCHAIN = AADD(INCHAIN, PTR, RHS)
----------------
topperc wrote:

```suggestion
// RAO arithmetic instructions.
// OUTCHAIN = AADD(INCHAIN, PTR, RHS)
```

https://github.com/llvm/llvm-project/pull/168421