[llvm] [VPlan] Consolidate VPIWithType and VPI (NFC) (PR #203019)

[Ramkumar Ramachandra via llvm-commits]

================

----------------
artagnon wrote:

Yes, sorry. Wrong snippet:

```cpp
  case VPInstruction::FirstActiveLane:
  case VPInstruction::LastActiveLane:
  case VPInstruction::NumActiveLanes:
  case VPInstruction::IncomingAliasMask:
  case Instruction::Load:
  case Instruction::Alloca:
    llvm_unreachable("type must be passed explicitly");
```

```cpp
    : VPRecipeWithIRFlags(
          VPRecipeBase::VPInstructionSC, Operands,
          ResultTy ? ResultTy
                   : computeScalarTypeForInstruction(Opcode, Operands),
          Flags, DL),
```

I suppose we should add an llvm_unreachable for casts -- will post a PR shortly.

https://github.com/llvm/llvm-project/pull/203019