Auto merge of #159854 - camelid:selfty-head, r=notriddle,GuillaumeGomez rustdoc: Only analyze head of self type when deciding impl inlining We only care about whether the self type is a generic or an item (inlined) in the current crate, so we don't actually need to compute the param_env, which is expensive when done to every external impl. This PR avoids computing the param_env until we actually decide to inline the impl. Moreover, it adds specialized cleaning logic for types that stops after the "head" (the top-level structure) is constructed, which is enough for the self type-based impl inlining analysis.
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