[llvm] [VPlan] Be more careful with CSE in replicate regions. (PR #162110)

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

```suggestion
        Result = hash_combine(Result, RFlags->getPredicate());
    const VPRegionBlock *RepR = Def->getParent()->getParent();
    if (RepR && RepR->isReplicator())
      Result = hash_combine(Result, Def->getParent());
```

https://github.com/llvm/llvm-project/pull/162110