Auto merge of #115039 - jackh726:impl_compare_add_alias_obligations, r=aliemjay

Add projection obligations when comparing impl too

Fixes #115033

In the test, when we ask for WF obligations of `DatasetIter<'a, ArrayBase<D>>`, we get back two important obligations: `[<D as Data>::Elem -> ?1, ?1: 'a]`. If we don't add the projection obligation, `?1` remains unconstrained.

An alternative solution would be to use unnormalized obligations, where we only have one relevant obligation: `<D as Data>::Elem: 'a`. This would leave no inference vars unconstrained.

Author: bors