Sema: Fix logic error in TypeReprCycleCheckWalker handling of 'Self.Foo' #70830
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We don't want to throw out a witness if it has any mention of 'Self.Foo'; we must also check that 'Foo' is one of the associated types being inferred. Otherwise, it may be a protocol type alias, in which case we want to proceed with the witness.
This fixes a regression from a recent change, a576984.
Fixes rdar://problem/120743365.