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This patch updates the `omp.parallel` operation according to the results of the discussion in [this RFC](https://discourse.llvm.org/t/rfc-disambiguation-between-loop-and-block-associated-omp-parallelop/79972). It is removed from the set of loop wrapper operations, changing the expected MLIR representation for composite `distribute parallel do/for` into the following: ```mlir omp.parallel { ... omp.distribute { omp.wsloop { omp.loop_nest ... { ... } omp.terminator } omp.terminator } ... omp.terminator } ``` MLIR verifiers for operations impacted by this representation change are updated, as well as related tests. The `LoopWrapperInterface` is also updated, since it's no longer representing an optional "role" of an operation but a mandatory set of restrictions instead.