Implement (Sugared) Bound Generic Extensions #41172
Merged
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A scoped-down version of #39307. Implement extension of bound generic types. The important bit here is in TypeCheckGeneric where we now use the underlying type of a typealias and its associated nominal type decl when we're generating substitutions for the extended type.
Put this behind a new experimental flag
Resolves SR-4875
Resolves rdar://84960366