Auto merge of #36649 - eddyb:selfish-idents, r=pnkfelix

Don't let a type parameter named "Self" unchanged past HIR lowering.

Fixes #36638 by rewriting `Self` type parameters (which are a parse error) to a `gensym("Self")`.

Background: #35605 introduced code across rustc that determines `Self` by its keyword name.
Reverting the sanity checks around that would inadvertently cause confusion between the true `Self` of a `trait` and other type parameters named `Self` (which have caused parse errors already).

I do not like to use `gensym`, and we may do something different here in the future, but this should work.

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