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Delay replacing escaping bound vars in `FindParamInClause` By uplifting the `BoundVarReplacer`, which is used by (e.g.) normalization to replace escaping bound vars that are encountered when folding binders, we can use a similar strategy to delay the instantiation of a binder's contents in the `FindParamInClause` used by the new trait solver. This should alleviate the recently added requirement that `Binder<T>: TypeVisitable` only if `T: TypeFoldable`, which was previously required b/c we were calling `enter_forall` so that we could structurally normalize aliases that we found within the predicates of a param-env clause. r? lcnr
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.