Rollup merge of #159181 - quiode:mem--forget-implicit-writes, r=RalfJung add rustc_no_writable to mem::forget and structs it uses This builds upon https://github.com/rust-lang/rust/pull/155207 and is similar to https://github.com/rust-lang/rust/pull/157202. It adds the `#[rustc_no_writable]` attribute to `mem::forget` and the `MaybeDangling` and `ManuallyDrop`. This makes Miri with Tree Borrows and implicit writes no longer report UB for a test in `derive_more`. As the pattern itself is quite unclean, and I have not seen `mem::forget` to cause trouble before with implicit writes, I'm not sure how much sense it makes to add it to `mem::forget`. The test works unter Tree Borrows, but fails already for Stacked Borrows. Thus I would be happy for some guidance if the attribute makes sense here @RalfJung @JoJoDeveloping.
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