Adjust the indices in _pjit_partial_eval to account for removed primals. #20270
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idx_map
indexes the residuals that are also primals (ie. duplicated in the output of known_jaxpr), which are then deduplicated. But non-residual primal outputs of known_jaxpr can also be removed on account of being forwarded inputs, which alters the previously calculated primal indices. We need to adjust them to account for this.Fixes #20267.