[VPlan] Improve code in VPWidenIntrinsic (NFC) (#141936)

Use operands() instead of {op_begin(), op_end()}.

Author: artagnon

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -1438,10 +1438,9 @@ class VPWidenIntrinsicRecipe : public VPRecipeWithIRFlags, public VPIRMetadata {
   VPWidenIntrinsicRecipe *clone() override {
     if (Value *CI = getUnderlyingValue())
       return new VPWidenIntrinsicRecipe(*cast<CallInst>(CI), VectorIntrinsicID,
-                                        {op_begin(), op_end()}, ResultTy,
-                                        getDebugLoc());
-    return new VPWidenIntrinsicRecipe(VectorIntrinsicID, {op_begin(), op_end()},
-                                      ResultTy, getDebugLoc());
+                                        operands(), ResultTy, getDebugLoc());
+    return new VPWidenIntrinsicRecipe(VectorIntrinsicID, operands(), ResultTy,
+                                      getDebugLoc());
   }
 
   VP_CLASSOF_IMPL(VPDef::VPWidenIntrinsicSC)