[VPlan] Improve code in VPWidenCallRecipe (NFC)

Also rename arg_operands to args to match CallBase.

Author: artagnon

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -1488,8 +1488,8 @@ class VPWidenCallRecipe : public VPRecipeWithIRFlags, public VPIRMetadata {
   ~VPWidenCallRecipe() override = default;
 
   VPWidenCallRecipe *clone() override {
-    return new VPWidenCallRecipe(getUnderlyingValue(), Variant,
-                                 {op_begin(), op_end()}, getDebugLoc());
+    return new VPWidenCallRecipe(getUnderlyingValue(), Variant, operands(),
+                                 getDebugLoc());
   }
 
   VP_CLASSOF_IMPL(VPDef::VPWidenCallSC)
@@ -1505,11 +1505,9 @@ class VPWidenCallRecipe : public VPRecipeWithIRFlags, public VPIRMetadata {
     return cast<Function>(getOperand(getNumOperands() - 1)->getLiveInIRValue());
   }
 
-  operand_range arg_operands() {
-    return make_range(op_begin(), op_begin() + getNumOperands() - 1);
-  }
-  const_operand_range arg_operands() const {
-    return make_range(op_begin(), op_begin() + getNumOperands() - 1);
+  operand_range args() { return make_range(op_begin(), std::prev(op_end())); }
+  const_operand_range args() const {
+    return make_range(op_begin(), std::prev(op_end()));
   }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -1235,7 +1235,7 @@ void VPWidenCallRecipe::execute(VPTransformState &State) {
   FunctionType *VFTy = Variant->getFunctionType();
   // Add return type if intrinsic is overloaded on it.
   SmallVector<Value *, 4> Args;
-  for (const auto &I : enumerate(arg_operands())) {
+  for (const auto &I : enumerate(args())) {
     Value *Arg;
     // Some vectorized function variants may also take a scalar argument,
     // e.g. linear parameters for pointers. This needs to be the scalar value
@@ -1284,7 +1284,7 @@ void VPWidenCallRecipe::print(raw_ostream &O, const Twine &Indent,
   O << "call";
   printFlags(O);
   O << " @" << CalledFn->getName() << "(";
-  interleaveComma(arg_operands(), O, [&O, &SlotTracker](VPValue *Op) {
+  interleaveComma(args(), O, [&O, &SlotTracker](VPValue *Op) {
     Op->printAsOperand(O, SlotTracker);
   });
   O << ")";