Add support for marking impls as `final` to say they can't be specialized. This allows generic functions that see that the impl applies to determine the values for its associated types. For example this allows us to say that the implementation of the `Deref` interface for pointers can't be specialized. Otherwise, `*p` could have unknown type in a generic function.
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
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josh11bandChandler Carruth
3f12316d6b