Rollup merge of #119813 - oli-obk:even_more_follow_up_errors2, r=estebank

Silence some follow-up errors [2/x]

this is one piece of the requested cleanups from https://github.com/rust-lang/rust/pull/117449

the `type_of` query frequently uses astconv to convert a `hir::Ty` to a `ty::Ty`. This process is infallible, but may produce errors as it goes. All the error reporting sites that had access to the `ItemCtxt` are now tainting it, causing `type_of` to return a `ty::Error` instead of anything else.

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