[SE-0302] Implement structural conformances to Sendable. #38669
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…rmance. Give BuiltinProtocolConformance a generic signature, which can be used to describe the generic parameters used within the builtin conformance, e.g., `<T1, T2, T3>` for a tuple type `(T1, T2, T3)`. Also store the conditional requirements as trailing objects, requiring them to be precomputed by whatever builds the conformances. Together, this means that builtin protocol conformances act like normal conformances with respect to conditional requirements and substitutions: they will be defined generically, then a specialized conformance will be layered on top to provide the substitutions.
Add implement conformance of structural types to Sendable as appropriate: * A tuple type is Sendable when its element types are Sendable * A metatype type is Sendable * A function type is Sendable if it is @sendable, thin, or C * A builtin type is always Sendable Implements rdar://76836578.
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…ol". Now that we synthesize conformances for structural types to `Sendable`, we can just do this check.
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Add implicit conformance of structural types to
Sendableas appropriate:Sendablewhen its element types areSendableSendableSendableif it is@Sendable, thin, or CSendableImplements rdar://76836578.