[llvm] [mlir] [OpenMP][MLIR] Fix threadprivate lowering when compiling for target when target operations are in use (PR #119310)

[Sergio Afonso via llvm-commits]

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

Thank you Andrew, this LGTM. I have some minimal non-blocking comments.

Can you write an MLIR to LLVM IR unit test with a minimal reproducer for this issue?

https://github.com/llvm/llvm-project/pull/119310