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After discussion in `D93482` we found that the some of the clauses were not following the common OmpClause convention. The benefits of using OmpClause: - Functionalities from structure checker are mostly aligned to work with `llvm::omp::Clause`. - The unparsing as well can take advantage. - Homogeneity with OpenACC and rest of the clauses in OpenMP. - Could even generate the parser with TableGen, when there is homogeneity. - It becomes confusing when to use `flangClass` and `flangClassValue` inside TableGen, if incase we generate parser using TableGen we could have only a single `let expression`. This patch makes `OmpNoWait` clause part of `OmpClause`. Reviewed By: clementval, kiranktp Differential Revision: https://reviews.llvm.org/D93643