[llvm] LoopVectorize/test: add missing CHECK lines, cleanup intrinsic.ll (PR #70202)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

Hi. I'll investigate the test change in the morning, but I don't quite understand your "wrapping is strange" comments: can you clarify what you mean? I agree that it looks a bit strange on the GitHub UI, but it looks fine in my editor.

https://github.com/llvm/llvm-project/pull/70202