Repo: Clean up some lint attributes #1456
Merged
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Notably this removes the crate-level expect(unsafe_code) from vmcore, replacing it with much more narrowly scoped expects, and adding forbid(unsafe_code) to its other modules. This expect is needed due to our use of linkme inside the implementation of deriving SavedStateRoot. It is not needed on our derivations of this trait elsewhere, as the lint is suppressed when it comes from a macro invocation from a different crate. This is the only place we derive SavedStateRoot in vmcore itself.