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[XLA] Remove a check that verified channel_ids for host send/recv ins…
…tructions were unique. We can't think of why this check is needed in the first place, and it breaks as soon as one has a host send/recv inside an inner computation in the presence of inlining. For example, consider the pseudo-code: ``` def f(...): send(..., channel_id=42) def main(...): f(...) f(...) ``` If we inline `f`, then we now violate that invariant. But inlining is something that should always be safe to do. PiperOrigin-RevId: 689478598
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