[llvm] [CSSPGO] Don't let pseudo probes block early-exit vectorization (PR #220149)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

This should probably be tagged as `[LV]` or something, because that's the code it touches.

I could not find an intrinsic definition of `pseudoprobe` in `LangRef`. Without that, it is difficult to reason about the patch

https://github.com/llvm/llvm-project/pull/220149