[llvm] [RISCV] Fix crash in combinePExtTruncate for truncate(srl) without MUL/SUB (PR #186141)

[Craig Topper via llvm-commits]

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@@ -16965,6 +16965,10 @@ static SDValue combinePExtTruncate(SDNode *N, SelectionDAG &DAG,
     }
   }
 
+  // Ensure Op is a binary operation before accessing its operands.
+  if (Op.getNumOperands() < 2)
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topperc wrote:

`!= 2`?

https://github.com/llvm/llvm-project/pull/186141