Auto merge of #44220 - kennytm:fix-44216-instance-plus-max-duration-should-panic, r=alexcrichton

Properly detect overflow in Instance ± Duration.

Fix #44216.
Fix #42622

The computation `Instant::now() + Duration::from_secs(u64::max_value())` now panics. The call `receiver.recv_timeout(Duration::from_secs(u64::max_value()))`, which involves such time addition, will also panic.

The reason #44216 arises is because of an unchecked cast from `u64` to `i64`, making the duration equivalent to -1 second.

Note that the current implementation is over-conservative, since e.g. (-2⁶²) + (2⁶³) is perfectly fine for an `i64`, yet this is rejected because (2⁶³) overflows the `i64`.

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