Auto merge of #75132 - scottmcm:stabilize-range-is-empty, r=dtolnay

Stabilize Range[Inclusive]::is_empty

I would like to propose these two simple methods for stabilization:
- Knowing that a range is exhausted isn't otherwise trivial
- Clippy would like to suggest them, but had to do extra work to disable that path <https://github.com/rust-lang/rust-clippy/issues/3807> because they're unstable
- These work on `PartialOrd`, consistently with the stable `contains` method, and are thus more general than iterator-based approaches that need `Step`
- They've been unchanged for some time, and have picked up uses in the compiler
- Stabilizing them doesn't block any future iterator-based `is_empty` plans, as these inherent ones are preferred in name resolution

https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty

Closes #48111

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