[llvm] [memprof] Skip MemProfUsePass on the empty module (PR #117210)

[Teresa Johnson via llvm-commits]

https://github.com/teresajohnson approved this pull request.

The code change lgtm but the description might need a slight tweak, I feel like there is a missing/wrong word or so in "This patch teaches the MemProfUsePass on the empty module."

https://github.com/llvm/llvm-project/pull/117210