Reject TARGET constructs that use a declare mapper with an iterator LLVM IR translation cannot yet emit a mapper with iterator map entries, and an omp.target that uses one aborts in OpenMPIRBuilder instead of reporting an error. Report such TARGET constructs as not yet implemented in lowering, following map members and nested mappers. Also check omp.target in translation, because FIR passes can attach a mapper after lowering, for example to a privatized variable of a kind-parameterized type.
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