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The `assumes` directive is an OpenMP 5.1 feature that allows the user to provide assumptions to the optimizer. Assumptions can refer to directives (`absent` and `contains` clauses), expressions (`holds` clause), or generic properties (`no_openmp_routines`, `ext_ABCD`, ...). The `assumes` spelling is used for assumptions in the global scope while `assume` is used for executable contexts with an associated structured block. This patch only implements the global spellings. While clauses with arguments are "accepted" by the parser, they will simply be ignored for now. The implementation lowers the assumptions directly to the `AssumptionAttr`. Reviewed By: ABataev Differential Revision: https://reviews.llvm.org/D91980
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