[llvm] [SelectionDAG] Use the nuw flag when expanding loads. (PR #119288)

[Derek Schuff via llvm-commits]

dschuff wrote:

It reminded me of https://github.com/llvm/llvm-project/pull/80184 which I let drop and didn't get back around to, maybe I should back that one up to the uncontroversial part and try again.

https://github.com/llvm/llvm-project/pull/119288