[llvm] [DAGTypeLegalize] Legalize ISD::POISON as ISD::UNDEF for Float Type Legalization (PR #135056)

[Jakub Kuderski via llvm-commits]

https://github.com/kuhar commented:

Thanks for looking into this.

Now that the base PR is reverted, can you pull in the original change from https://github.com/llvm/llvm-project/pull/125883 to reland this?

https://github.com/llvm/llvm-project/pull/135056