[llvm] [ISel] Introduce llvm.clmul intrinsic (PR #168731)

[Craig Topper via llvm-commits]

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@@ -767,6 +767,11 @@ enum NodeType {
   FSHL,
   FSHR,
 
+  /// Carry-less multiplication operations.
+  CLMUL,
+  CLMULR,
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topperc wrote:

Do we need to introduce CLMULR/CLMULH in this patch? These feel like optimizations that can be done separate from basic enabling.

https://github.com/llvm/llvm-project/pull/168731