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This PR starts the effort to upstream AMD's internal implementation of `do concurrent` to OpenMP mapping. This replaces #77285 since we extended this WIP quite a bit on our fork over the past year. An important part of this PR is a document that describes the current status downstream, the upstreaming status, and next steps to make this pass much more useful. In addition to this document, this PR also contains the skeleton of the pass (no useful transformations are done yet) and some testing for the added command line options. This looks like a huge PR but a lot of the added stuff is documentation. It is also worth noting that the downstream pass has been validated on https://github.com/BerkeleyLab/fiats. For the CPU mapping, this achived performance speed-ups that match pure OpenMP, for GPU mapping we are still working on extending our support for implicit memory mapping and locality specifiers. PR stack: - https://github.com/llvm/llvm-project/pull/126026 (this PR) - https://github.com/llvm/llvm-project/pull/127595 - https://github.com/llvm/llvm-project/pull/127633 - https://github.com/llvm/llvm-project/pull/127634 - https://github.com/llvm/llvm-project/pull/127635