Reconsider #5656 after Range::is_empty stabilization

[scottmcm]

I don't want to make clippy logic changes as part of a stabilization PR, so I'm filing this to remind myself to follow up with a better clippy change.

Stabilization PR: rust-lang/rust#75132
Clippy change to potentially revert: #5656

[ebroto]

I can take care of fixing this so it lands with 1.47.

Hmm wait, we will not sync clippy until after 1.46 is released, so it will have to be for 1.48.

[flip1995]

The rust PR may not even hit beta. And if it does we can still make those changes and backport them.

[scottmcm]

Ok, the stabilization did hit beta.

I've not changed clippy before; what's the best update to make here? Maybe revert #5656, but then put back the Range/RangeInclusive-specific tests?

PR Up.

[flip1995]

I will do the backport after the release on Thursday 👍

[flip1995]

rust-lang/rust#76051