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Rollup merge of #135733 - frank-king:feature/pin-self-receiver, r=oli-obk,traviscross
Implement `&pin const self` and `&pin mut self` sugars
This PR implements part of #130494.
It introduces the sugars `&pin const self` and `&pin mut self` for `self: Pin<&Self>` and `self: Pin<&mut Self>`.
