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

[Henrich Lauko via llvm-branch-commits]

xlauko wrote:

> 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?

TIL, that would be best. Though there is one test failing on the roundtrip at the moment: https://github.com/llvm/llvm-project/issues/161441

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