[Rendezvous] Add a performance counter for tracking how many dead tensors are sent.
[Rendezvous] Add a performance counter for tracking how many dead tensors are sent.

This could provide useful input for identifying where a graph with control flow is partitioned in an inefficient way with a large number of cross-device dead edges, and could be refactored into a more efficient graph (e.g. with a multi-device function call inside one branch of a conditional).

PiperOrigin-RevId: 293662534
Change-Id: I4fc37a903129bbeffa38fdece17a4316fc26d8d9

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