[llvm] [VPlan] Use DerivedIV in convertToStridedAccesses (PR #209611)

[Mel Chen via llvm-commits]

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@@ -2559,6 +2565,10 @@ bool VPIRFlags::flagsValidForOpcode(unsigned Opcode) const {
     return Opcode == Instruction::FCmp || Opcode == Instruction::ICmp;
   case OperationType::ReductionOp:
     return Opcode == VPInstruction::ComputeReductionResult;
+  case OperationType::BinOpGEP:
+    return Opcode == Instruction::GetElementPtr || Opcode == Instruction::Add ||
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Mel-Chen wrote:

Do we need to check VPInstruction::PtrAdd here?

https://github.com/llvm/llvm-project/pull/209611