[llvm] [LV] Improve materialisation of VFxUF for scalable vectors (PR #216708)

[David Sherwood via llvm-commits]

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david-arm wrote:

Hmm, I can't see the code you're referring. It's probably because I'm not using the "New Experience" version of github, which fails miserably with my browser. However, I'm pretty sure:

```
  VPValue *MulByUF =
      Builder.createElementCount(TCTy, VFEC * Plan.getConcreteUF());
  VFxUF.replaceAllUsesWith(MulByUF);
```


https://github.com/llvm/llvm-project/pull/216708