[VPlan] Use operands() driectly in VPInstruction::clone() (NFC).

There's no need to create temporary SmallVectors.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -1110,9 +1110,8 @@ class LLVM_ABI_FOR_TEST VPInstruction : public VPRecipeWithIRFlags,
   VP_CLASSOF_IMPL(VPDef::VPInstructionSC)
 
   VPInstruction *clone() override {
-    SmallVector<VPValue *, 2> Operands(operands());
-    auto *New =
-        new VPInstruction(Opcode, Operands, *this, *this, getDebugLoc(), Name);
+    auto *New = new VPInstruction(Opcode, operands(), *this, *this,
+                                  getDebugLoc(), Name);
     if (getUnderlyingValue())
       New->setUnderlyingValue(getUnderlyingInstr());
     return New;
@@ -1226,10 +1225,9 @@ class VPInstructionWithType : public VPInstruction {
   }
 
   VPInstruction *clone() override {
-    SmallVector<VPValue *, 2> Operands(operands());
     auto *New =
-        new VPInstructionWithType(getOpcode(), Operands, getResultType(), *this,
-                                  getDebugLoc(), getName());
+        new VPInstructionWithType(getOpcode(), operands(), getResultType(),
+                                  *this, getDebugLoc(), getName());
     New->setUnderlyingValue(getUnderlyingValue());
     return New;
   }