[llvm-branch-commits] [clang] [CIR] Make all opt tests verify roundtrip (PR #161439)

[Andy Kaylor via llvm-branch-commits]

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

This looks fine, but I noticed that mlir-opt has a build option that causes it to implicitly add this argument in LIT tests. Should we do that?

https://github.com/llvm/llvm-project/pull/161439