Copybara import of the project:
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f79d1060cccf7c9a1c02d0bcab06c6ee0ef795a8 by George Necula <gcnecula@gmail.com>:
[export] Fix
A user reported an error when trying to export a function
that has a "lower" attribute (to impersonate a jitted function)
but does not have a "__name__" attribute.
The solution is to use the default name "<unnamed function>".
While I was at it I have added a `util.fun_name` to get
the name of a Callable, and I use it in several places.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/jax/pull/21572 from gnecula:exp_fix_name f79d1060cccf7c9a1c02d0bcab06c6ee0ef795a8
PiperOrigin-RevId: 639236990
