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[Flang][OpenMP][OMPIRBuilder] Add lowering of TargetOp for device codegen #209
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…egen This patch adds support in the `OpenMPIRBuilder` for generating working device code for OpenMP target regions. It generates and handles the result of a call to `__kmpc_target_init()` at the beginning of the function resulting from outlining each target region, and it also generates the matching `__kmpc_target_deinit()` call before returning. It relies on the implementation of target region outlining for host codegen to handle the production of the new function and the lowering of its body based on the contents of the associated target region. Depends on D147172 Differential Revision: https://reviews.llvm.org/D147940
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