[llvm] [VP] Merge ExpandVP pass into PreISelIntrinsicLowering (PR #101652)

[Steven Wu via llvm-commits]

cachemeifyoucan wrote:

This also seems to break the expensive check on Darwin:
https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-cmake-RA-expensive/1545/testReport/junit/LLVM/Transforms_PreISelIntrinsicLowering/expand_vp_ll/

```
LLVM ERROR: Function @test_vp_int_v8 changed by PreISelIntrinsicLoweringPass without invalidating analyses
```

I don't think that is the same fix in the followup. Can you take a look?

https://github.com/llvm/llvm-project/pull/101652