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No, it is not possible to disable loop pipelining, and there is probably little to no reason to do so either. Why do you want to disable pipelining?
The max_concurrency parga is designed for a different reason (controlling replication factor for multi-ported RAM/ROM buffers used in a single work-item loop by limiting number of loop iteration that can be in-flight concurrently).
For more complete information about compiler optimizations, see our Optimization Notice.