[llvm] [X86] Adding lowerings for vector ISD::LRINT and ISD::LLRINT (PR #90065)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> > Isn't it a poison vaule if the inputs larger than 2^32 according to [LLVM LangRef](https://llvm.org/docs/LangRef.html#trunc-to-instruction)?
> 
> I think only if the `trunc` would have a `nuw` flag, which isn't present in the reproducer?

Yes, you are correct!

https://github.com/llvm/llvm-project/pull/90065