ref fix in custom_vjp

[sharadmv]

[gemini-code-assist[bot]]

Summary of Changes

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This pull request refines the effect tracking mechanism within JAX's partial evaluation system. It specifically adjusts how internal mutable array effects are categorized, aligning their treatment with named axis effects. This change is intended to ensure more accurate effect identification, which is crucial for the correctness of advanced differentiation features like custom_vjp.

Highlights

• Effect Handling Logic: The has_effects function in jax/_src/interpreters/partial_eval.py has been updated to treat core.InternalMutableArrayEffect similarly to core.NamedAxisEffect. This means both types of effects are now excluded when determining if a set of effects is considered 'present' or 'significant' for certain internal JAX operations.

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