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

[Craig Topper via llvm-commits]

================
@@ -10347,6 +10347,7 @@ SDValue RISCVTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
     return DAG.getNode(RISCVISD::MOPRR, DL, XLenVT, Op.getOperand(1),
----------------
topperc wrote:

We need `setOperationAction(ISD::CLMUL, XLenVT, Legal)` in the constructor in this  file when `Subtarget.hasStdExtZbcOrZbkc()` is true.

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