[JAX] Change jax.core.Trace subclasses to call super().__init__(). #814
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[JAX] Change jax.core.Trace subclasses to call super().init().
Test the value of Trace._invalidated directly rather than using a hasattr test. I'm assuming the reason we did this is because we wanted to avoid updating all the subclasses to call super().init().
hasattr() tests are unnecessarily slow (did you know the one in jax.core.Trace builds an error message every time it fails?)