[llvm] [mlir] [llvm][OpenMP] Add implicit cast to omp.atomic.read (PR #114659)

[Michael Kruse via llvm-commits]

Meinersbur wrote:

I would remove the changes to Clang and AtomicsExpandPass (in the first iteration). Those were for checking whether the API is sufficiently general.

https://github.com/llvm/llvm-project/pull/114659