Change isinstance test in xla_bridge.py to not explicitly name xla_client.Backend. (#2868)
Change isinstance test in xla_bridge.py to not explicitly name xla_client.Backend. (#2868)

Change in preparation for removing xla_client.Backend in favor of the underlying C++ classes.
tensorflow/probability,google/jax,google/jax,google/jax,google/jax,tensorflow/probability