[llvm] [openacc][openmp] Add dialect representation for acc atomic operations (PR #65493)

[Aart Bik via llvm-commits]

aartbik wrote:

> @aartbik Since I added new interfaces, several cmake files had to be updated. I attempted to do the same for the bazel build but did not test it. Would you mind looking through the changes? Thank you!

It is very kind of you to include the bazel builds too (especially since this is not a requirement for submitting to MLIR), since it helps people integrating changes into bazel-based repos enormously.  The changes look good to me (although indeed actually testing them will reveal any lingering issue) and will help integrators a lot!

https://github.com/llvm/llvm-project/pull/65493