[llvm] [ARM][SDAG] Half promote llvm.lrint nodes. (PR #161088)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

(Like I mentioned, we probably want to mark more variants of lrint "Expand", but we can leave that for a followup.)

https://github.com/llvm/llvm-project/pull/161088