[clang] [llvm] [mlir] Revert "[OpenMP][Mappers] Fix ref-count tracking for maps inserted by mappers. (#177059)" (PR #177623)

[Shilei Tian via cfe-commits]

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

Let's revert this first to make sure the BB is green first.

https://github.com/llvm/llvm-project/pull/177623