[llvm] [VectorCombine] Avoid push_back in range-for (PR #196741)

[Simon Pilgrim via llvm-commits]

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RKSimon wrote:

You might be able to use make_range instead?
```
for (ShuffleVectorInst *SV : make_range(Shuffles.begin(), Shuffles.end())) {
```

https://github.com/llvm/llvm-project/pull/196741