[OPENMP52] Support Support omp_cur_iteration modifier for doacross clause. This is just syntax to make it easier for the user. It doesn't add any new functionality. for doacross(sink: omp_cur_iteration - 1) Equivalent to doacross(sink: ConterVar - 1, ...) doacross(source: omp_cur_iteration) Equivalent to doacross(source) And restriction is: OMP5.2 p.327 If vector is specified with the omp_cur_iteration keyword and with sink as the dependence-type then it must be omp_cur_iteration - 1. If vector is specified with source as the dependence-type then it must be omp_cur_iteration. Differential Revision: https://reviews.llvm.org/D154556
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