Rollup merge of #79310 - jyn514:fold-item-cleanup, r=GuillaumeGomez
Make `fold_item_recur` non-nullable This gets rid of a bunch of `unwrap()`s and makes it a little more clear what's going on. Originally I wanted to make `fold_item` non-nullable too, which would have been a lot nicer to work with, but unfortunately `stripper` does actually return `None` in some places. I might make a follow-up moving stripper to be special and not a pass so that passes can be non-nullable. Found while working on https://github.com/rust-lang/rust/issues/76998.
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