[SILGen] Handle marker existentials in emitCBridgedToNativeValue.
#70553
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The id-to-Any bridging path in
emitCBridgedToNativeValuewas not taken when the native type was a marker existential such asany Sendable, which would lead to crashes when emitting references to imported properties marked with__attribute__((swift_attr("@Sendable"))).Resolves rdar://119708690