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`last_REMB_*` can be at `time_point::min()` when `delayMonitor()` is called. This results in a signed integer overflow, which UBASAN doesn't like. Fix this by setting `last_REMB_*` to `clock::now()` before setting callback. Change-Id: I0b24d759927c2eb7e23253a16333ba54dc3f9edf
4c18f940