[llvm] [IR] Add llvm `cmul` intrinsic (PR #140301)

[Jay Foad via llvm-commits]

================
@@ -751,6 +751,9 @@ enum NodeType {
   ROTR,
   FSHL,
   FSHR,
+  
+  /// CLMUL operator
----------------
jayfoad wrote:

Suggest:
```suggestion
  /// Carryless multiplication operator
```

https://github.com/llvm/llvm-project/pull/140301