[Distributed] Move property synthesis to DerivedConformanceDistributedActor

test/Distributed/distributed_actor_basic.swift

@@ -6,4 +6,36 @@ import _Distributed
 
 @available(SwiftStdlib 5.5, *)
 distributed actor DA {
+}
+
+@available(SwiftStdlib 5.5, *)
+distributed actor First {
+  distributed func one(second: Second) async throws {
+    try await second.two(first: self, second: second)
+  }
+}
+
+@available(SwiftStdlib 5.5, *)
+distributed actor Second {
+  distributed func two(first: First, second: Second) async {
+    try! await first.one(second: self)
+  }
+}
+
+// ==== ------------------------------------------------------------------------
+
+@available(SwiftStdlib 5.5, *)
+extension First {
+  @_dynamicReplacement (for :_remote_one(second:))
+  nonisolated func _impl_one(second: Second) async throws {
+    fatalError()
+  }
+}
+
+@available(SwiftStdlib 5.5, *)
+extension Second {
+  @_dynamicReplacement (for :_remote_two(first:second:))
+  nonisolated func _impl_two(first: First, second: Second) async throws {
+    fatalError()
+  }
 }