Account for binders correctly when adding default RPITIT method assumption #108583
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As of #108203, we install extra projection predicates into the param-env of a default trait method when it has return-position
impl Trait
(or is async).The implementation didn't account for the fact that it's walking into and out of binders, so we just need to shift all the debruijn indices accordingly when constructing the projection predicates.
Fixes #108579
r? types