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7307dc0ca1
Distinguish prepending and replacing self ty in predicates There are two kinds of functions called `with_self_ty`: 1. Prepends the `Self` type onto an `ExistentialPredicate` which lacks it in its internal representation. 2. Replaces the `Self` type of an existing predicate, either for diagnostics purposes or in the new trait solver when normalizing that self type. This PR distinguishes these two because I often want to only grep for one of them. Namely, let's call it `with_replaced_self_ty` when all we're doing is replacing the self type.