add objc coverage to actor_init_abi test

Author: kavon

test/Concurrency/Runtime/Inputs/MysteryInit.swift

@@ -1,19 +1,43 @@
+import Foundation
 
 // This input is useful to ensure the delegation status of
 // an actor's initializer does not affect ABI stability
-public actor BigFoot {
 
-  public let name: String
+public protocol NamedEntity: Actor {
+  nonisolated var name: String? { get }
+}
+
+public actor BigFoot: NamedEntity {
+
+  public nonisolated let name: String?
+
+  private init(withName name: String) {
+    self.name = name
+  }
+
+  public init() {
+  #if DELEGATES
+    self.init(withName: "Sasquatch")
+  #else
+    self.name = nil
+  #endif
+  }
+}
+
+
+@objc public actor BigFootObjC: NSObject, NamedEntity {
+
+  public nonisolated let name: String?
 
   private init(withName name: String) {
     self.name = name
   }
 
-  public init?() {
+  @objc public override init() {
   #if DELEGATES
     self.init(withName: "Sasquatch")
   #else
-    return nil
+    self.name = nil
   #endif
   }
 }

test/Concurrency/Runtime/actor_init_abi.swift

@@ -54,16 +54,30 @@
 
 import MysteryInit
 
-@main
-struct Main {
-  static func main() {
-    switch BigFoot() {
+// NOTE: the number of myth/real checks in this function (in either mode) should
+// match the number of times `test` is called. The -NOT check is there to catch
+// any mistakes in updating the test.
+func test(_ bigFoot: any NamedEntity) {
+  switch bigFoot.name {
     case .none:
       print("bigfoot is myth")
       // CHECK-NO-DELEGATES: bigfoot is myth
+      // CHECK-NO-DELEGATES: bigfoot is myth
+
+      // CHECK-NO-DELEGATES-NOT: bigfoot
     default:
       print("bigfoot is real")
       // CHECK-DELEGATES: bigfoot is real
+      // CHECK-DELEGATES: bigfoot is real
+
+      // CHECK-DELEGATES-NOT: bigfoot
     }
+}
+
+@main
+struct Main {
+  static func main() {
+    test(BigFoot())
+    test(BigFootObjC())
   }
 }