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Now all operations with a reduction clause have an array of bools controlling whether each reduction variable should be passed by reference or value. This was already supported for Wsloop and Parallel. The new operations modified here currently have no flang lowering or translation to LLVMIR and so further changes are not needed. It isn't possible to check the verifier in mlir/test/Dialect/OpenMP/invalid.mlir because there is no way of parsing an operation to have an incorrect number of byref attributes. The verifier exists to pick up buggy operation builders or in-place operation modification.