96bc07d492
Support for translating the operations introduced in #144785 to LLVM-IR. In order to keep the lowering simple, `OpenMPIRBuider::unrollLoopHeuristic` is applied when encountering the `omp.unroll_heuristic` op. As a result, the operation that unrolling is applied to (`omp.canonical_loop`) must have been emitted before even though logically there is no such requirement. Eventually, all transformations on a loop must be applied directly after emitting `omp.canonical_loop`, i.e. future transformations must be looked-up when encountering `omp.canonical_loop` itself. This is because many OpenMPIRBuilder methods (e.g. `createParallel`) expect all the region code to be emitted withing a callback. In the case of `createParallel`, the region code is getting outlined into a new function. Therefore, making the operation order a formal requirement would not make the implementation any easier.
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