[llvm] [LV] Explicitly disable in-loop reductions for AnyOf and FindIV. nfc (PR #163541)

[Mel Chen via llvm-commits]

Mel-Chen wrote:

> I wonder there is a lot call of `RdxDesc.getOpcode()` in the function `LoopVectorizationCostModel::getReductionPatternCost`, if the `RecurKind` of `RdxDesc` is `AnyOf`, it will hit assert and crash, I am curious whether we have a test case for that ? @Mel-Chen or it never happen?

Not at the moment, since in-loop AnyOf is not yet supported.
```
    /// Return the cost of instructions in an inloop reduction pattern, if I is
    /// part of that pattern.
    std::optional<InstructionCost> getReductionPatternCost(Instruction *I,
                                                           ElementCount VF,
                                                           Type *VectorTy) const;
```

https://github.com/llvm/llvm-project/pull/163541