[llvm] [LV] Simplify creation of vp.load/vp.store/vp.reduce intrinsics (PR #143804)

[Florian Hahn via llvm-commits]

https://github.com/fhahn approved this pull request.

LGTM, thanks! Very happy to see this cleanup and removal of the now unused VectorBuilder

https://github.com/llvm/llvm-project/pull/143804