[llvm] [InstCombine] Baseline test exposing vector fp-to-int conversion becoming scalar (PR #165800)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> Poison looks like a sufficient replacement for undef in this case. Should I remove the undef variant?

It is ok as we have a corresponding poison variant.

https://github.com/llvm/llvm-project/pull/165800