RequirementMachine: Odds and ends in service of protocol requirement signature minimization #39647
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…t out of Sema For now, this still uses the GSB.
…col refinement For implementation reasons we want the requirement signature of a protocol to directly include all protocol refinement relationships, even if they can be derived via same-type requirements between Self and some nested type. Therefore, a protocol refinement rule [P].[Q] => [P] can only be replaced with a generating conformance equation that consists entirely of other conformance rules. This exactly simulates the existing behavior of the GSB's redundant requirements algorithm.
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Splitting off this PR from #39629.