Implement OptimizationBarrier and SchedulingBarrier for the XLA backend#36
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…A backend. Implemented `SchedulingBarrier` by means of a no-op from the dependencies.
…rge check delta relaxation
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This PR implements the
OptimizationBarrierandSchedulingBarrierinterfaces on the OpenXLA/PJRT backend:OptimizationBarrierconnects to PJRT's optimization barrier functionality (wrapped to bypass CPU backend implementation directly due to CPU-specific PJRT issues).SchedulingBarrieris implemented using an "add zero" dependency hack (similar todotGeneralAddDependency), ensuring dependency execution order in StableHLO.See discussion in gomlx/gomlx#422