Add an allow_negative_indices option to lax.dynamic_slice and lax.dynamic_update_slice. #24931
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Add an allow_negative_indices option to lax.dynamic_slice and lax.dynamic_update_slice.
The goal of this change is to avoid generating code to wrap negative indices back into range in cases where we know it doesn't matter. Change scan to pass allow_negative_indices=True to avoid emitting index wrapping code for each scan argument.